Add Kubernetes manifests for car.stinnesbeck.com

Namespace, InfluxDB 2.7.12 StatefulSet with PVC and a NetworkPolicy
that admits only the server, the server Deployment (non-root, read-only
root filesystem), a cert-manager Certificate from letsencrypt-prod and a
Traefik IngressRoute. Secrets are a template only. Nothing is applied;
k8s/README.md has the steps. Server version bumped to 1.1.0.

Validated offline with kustomize and kubeconform (including the
cert-manager and Traefik CRD schemas). The InfluxDB container was tested
locally as UID 1000 with no capabilities.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

k8s/README.md

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+# Kubernetes manifests — car.stinnesbeck.com
+
+Plain manifests for the car server and its InfluxDB 2. They are only files: nothing here is
+applied automatically. Apply them yourself.
+
+| File | What |
+|---|---|
+| `namespace.yaml` | Namespace `mg4` |
+| `influxdb.yaml` | InfluxDB 2.7.12 StatefulSet (10Gi PVC, default storage class), cluster-internal Service, NetworkPolicy allowing only the server |
+| `server.yaml` | Server Deployment (1 replica, non-root, read-only root filesystem) and Service |
+| `ingress.yaml` | cert-manager `Certificate` from `letsencrypt-prod`, Traefik `IngressRoute` on `websecure` |
+| `secrets.example.yaml` | **Template** for the two Secrets; not in `kustomization.yaml` |
+| `kustomization.yaml` | Everything except the Secrets; pins the server image tag |
+
+## Before the first apply
+
+1. **Check the ingress class** in `ingress.yaml`. It is set to `traefik-external` as a
+   placeholder; use the class of your public-facing Traefik.
+2. **Create the Secrets.** Copy `secrets.example.yaml` outside the repository, replace every
+   `CHANGE-ME` (`openssl rand -hex 32` for tokens), then apply the copy:
+   `influxdb-auth` (InfluxDB admin password and token) and `mg4-server` (ingest token,
+   session secret, dashboard password, your ABRP API key and user token).
+3. **Registry access.** If the `mg4-server` package on git.stinnesbeck.com is private, create
+   the `git-stinnesbeck-registry` pull secret (command in `secrets.example.yaml`); if it is
+   public, delete `imagePullSecrets` from `server.yaml`.
+
+## Apply
+
+```sh
+kubectl apply -f k8s/namespace.yaml
+kubectl apply -f <your filled-in secrets file>
+kubectl apply -k k8s/
+```
+
+The Let's Encrypt HTTP-01 challenge needs car.stinnesbeck.com to resolve to the public
+Traefik before the certificate can be issued; check with `kubectl -n mg4 get certificate`.
+
+## Notes
+
+- InfluxDB's setup mode runs only on an empty volume. Changing `admin-token` in the Secret
+  later does not change the token inside InfluxDB.
+- The server uses the InfluxDB admin token. A token scoped to the `mg4` bucket can replace it
+  later (`influx auth create --read-bucket … --write-bucket …`).
+- To upgrade the server, push a new image tag and change `newTag` in `kustomization.yaml`.

k8s/influxdb.yaml

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+# InfluxDB 2, cluster-internal only. On first start (empty volume) the image's setup mode
+# creates the org, the bucket and the admin token from the influxdb-auth Secret; on later
+# starts those variables are ignored and the data on the volume wins.
+apiVersion: apps/v1
+kind: StatefulSet
+metadata:
+  name: influxdb
+  namespace: mg4
+  labels:
+    app.kubernetes.io/name: influxdb
+    app.kubernetes.io/part-of: mg4
+spec:
+  serviceName: influxdb
+  replicas: 1
+  selector:
+    matchLabels:
+      app.kubernetes.io/name: influxdb
+  template:
+    metadata:
+      labels:
+        app.kubernetes.io/name: influxdb
+        app.kubernetes.io/part-of: mg4
+    spec:
+      securityContext:
+        runAsNonRoot: true
+        runAsUser: 1000
+        runAsGroup: 1000
+        fsGroup: 1000
+        seccompProfile:
+          type: RuntimeDefault
+      containers:
+        - name: influxdb
+          image: docker.io/library/influxdb:2.7.12-alpine
+          ports:
+            - name: http
+              containerPort: 8086
+          env:
+            - name: INFLUXD_REPORTING_DISABLED
+              value: "true"
+            - name: DOCKER_INFLUXDB_INIT_MODE
+              value: setup
+            - name: DOCKER_INFLUXDB_INIT_ORG
+              value: mg4
+            - name: DOCKER_INFLUXDB_INIT_BUCKET
+              value: mg4
+            - name: DOCKER_INFLUXDB_INIT_USERNAME
+              value: admin
+            - name: DOCKER_INFLUXDB_INIT_PASSWORD
+              valueFrom:
+                secretKeyRef:
+                  name: influxdb-auth
+                  key: admin-password
+            - name: DOCKER_INFLUXDB_INIT_ADMIN_TOKEN
+              valueFrom:
+                secretKeyRef:
+                  name: influxdb-auth
+                  key: admin-token
+          volumeMounts:
+            - name: data
+              mountPath: /var/lib/influxdb2
+            - name: config
+              mountPath: /etc/influxdb2
+          readinessProbe:
+            httpGet:
+              path: /health
+              port: http
+            periodSeconds: 10
+          livenessProbe:
+            httpGet:
+              path: /health
+              port: http
+            initialDelaySeconds: 30
+            periodSeconds: 30
+          resources:
+            requests:
+              cpu: 100m
+              memory: 256Mi
+            limits:
+              memory: 1Gi
+          securityContext:
+            allowPrivilegeEscalation: false
+            capabilities:
+              drop: ["ALL"]
+      volumes:
+        - name: config
+          emptyDir: {}
+  volumeClaimTemplates:
+    - metadata:
+        name: data
+      spec:
+        accessModes: ["ReadWriteOnce"]
+        # No storageClassName: the cluster's default class is used.
+        resources:
+          requests:
+            storage: 10Gi
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: influxdb
+  namespace: mg4
+  labels:
+    app.kubernetes.io/name: influxdb
+    app.kubernetes.io/part-of: mg4
+spec:
+  selector:
+    app.kubernetes.io/name: influxdb
+  ports:
+    - name: http
+      port: 8086
+      targetPort: http
+---
+# Only the server may reach InfluxDB. Has no effect on a CNI without NetworkPolicy support.
+apiVersion: networking.k8s.io/v1
+kind: NetworkPolicy
+metadata:
+  name: influxdb-from-server-only
+  namespace: mg4
+spec:
+  podSelector:
+    matchLabels:
+      app.kubernetes.io/name: influxdb
+  policyTypes: ["Ingress"]
+  ingress:
+    - from:
+        - podSelector:
+            matchLabels:
+              app.kubernetes.io/name: mg4-server
+      ports:
+        - port: 8086

k8s/ingress.yaml

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+# TLS certificate from cert-manager. cert-manager does not watch Traefik IngressRoutes, so the
+# certificate is requested explicitly and the IngressRoute references its Secret.
+apiVersion: cert-manager.io/v1
+kind: Certificate
+metadata:
+  name: car-stinnesbeck-com
+  namespace: mg4
+spec:
+  secretName: car-stinnesbeck-com-tls
+  dnsNames:
+    - car.stinnesbeck.com
+  issuerRef:
+    kind: ClusterIssuer
+    name: letsencrypt-prod
+---
+apiVersion: traefik.io/v1alpha1
+kind: IngressRoute
+metadata:
+  name: mg4-server
+  namespace: mg4
+  annotations:
+    # CHECK: the class of your public-facing Traefik. Your internal example uses
+    # "traefik-internal"; this host must be served by the external one.
+    kubernetes.io/ingress.class: traefik-external
+spec:
+  entryPoints:
+    - websecure
+  routes:
+    - kind: Rule
+      match: Host(`car.stinnesbeck.com`)
+      services:
+        - kind: Service
+          name: mg4-server
+          namespace: mg4
+          port: 80
+  tls:
+    secretName: car-stinnesbeck-com-tls

k8s/kustomization.yaml

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+# Render with `kustomize build k8s/` (or `kubectl kustomize k8s/`) and apply it yourself.
+# The Secrets are not included: create them from secrets.example.yaml first.
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+resources:
+  - namespace.yaml
+  - influxdb.yaml
+  - server.yaml
+  - ingress.yaml
+images:
+  - name: git.stinnesbeck.com/nils/mg4-server
+    newTag: "1.1.0"

k8s/namespace.yaml

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+apiVersion: v1
+kind: Namespace
+metadata:
+  name: mg4

k8s/secrets.example.yaml

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+# TEMPLATE ONLY — not part of kustomization.yaml. Copy it outside the repository, fill in
+# real values, and apply that copy yourself. Never commit the filled-in file.
+#
+#   openssl rand -hex 32     for every token and secret below
+apiVersion: v1
+kind: Secret
+metadata:
+  name: influxdb-auth
+  namespace: mg4
+type: Opaque
+stringData:
+  admin-password: CHANGE-ME-at-least-8-characters
+  admin-token: CHANGE-ME-openssl-rand-hex-32
+---
+apiVersion: v1
+kind: Secret
+metadata:
+  name: mg4-server
+  namespace: mg4
+type: Opaque
+stringData:
+  # The car's write token, entered in the app. At least 24 characters.
+  INGEST_TOKEN: CHANGE-ME-openssl-rand-hex-32
+  SESSION_SECRET: CHANGE-ME-openssl-rand-hex-32
+  DASHBOARD_PASSWORD: CHANGE-ME-at-least-8-characters
+  # Your ABRP credentials. Leave either empty to switch forwarding off.
+  ABRP_API_KEY: CHANGE-ME
+  ABRP_USER_TOKEN: CHANGE-ME
+  ABRP_MIN_INTERVAL_SECONDS: "5"
+---
+# Pull secret for a private image on git.stinnesbeck.com. Easier to create with:
+#   kubectl -n mg4 create secret docker-registry git-stinnesbeck-registry \
+#     --docker-server=git.stinnesbeck.com --docker-username=<user> --docker-password=<token>
+# If the package is public, remove imagePullSecrets from server.yaml instead.

k8s/server.yaml

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+# The car server. One replica on purpose: the ABRP rate limit is kept in memory, and two
+# replicas would each forward to ABRP at the full rate.
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: mg4-server
+  namespace: mg4
+  labels:
+    app.kubernetes.io/name: mg4-server
+    app.kubernetes.io/part-of: mg4
+spec:
+  replicas: 1
+  strategy:
+    type: Recreate
+  selector:
+    matchLabels:
+      app.kubernetes.io/name: mg4-server
+  template:
+    metadata:
+      labels:
+        app.kubernetes.io/name: mg4-server
+        app.kubernetes.io/part-of: mg4
+    spec:
+      # Needed only if the image is private on git.stinnesbeck.com; see secrets.example.yaml.
+      imagePullSecrets:
+        - name: git-stinnesbeck-registry
+      securityContext:
+        runAsNonRoot: true
+        runAsUser: 10001
+        runAsGroup: 10001
+        seccompProfile:
+          type: RuntimeDefault
+      containers:
+        - name: server
+          image: git.stinnesbeck.com/nils/mg4-server:latest # pinned by kustomization.yaml
+          ports:
+            - name: http
+              containerPort: 3000
+          env:
+            - name: INFLUX_URL
+              value: http://influxdb.mg4.svc:8086
+            - name: INFLUX_ORG
+              value: mg4
+            - name: INFLUX_BUCKET
+              value: mg4
+            - name: INFLUX_TOKEN
+              valueFrom:
+                secretKeyRef:
+                  name: influxdb-auth
+                  key: admin-token
+          # INGEST_TOKEN, SESSION_SECRET, DASHBOARD_PASSWORD, ABRP_API_KEY, ABRP_USER_TOKEN.
+          envFrom:
+            - secretRef:
+                name: mg4-server
+          readinessProbe:
+            httpGet:
+              path: /v1/health
+              port: http
+            periodSeconds: 10
+          livenessProbe:
+            httpGet:
+              path: /v1/health
+              port: http
+            initialDelaySeconds: 10
+            periodSeconds: 30
+          resources:
+            requests:
+              cpu: 50m
+              memory: 128Mi
+            limits:
+              memory: 512Mi
+          securityContext:
+            allowPrivilegeEscalation: false
+            readOnlyRootFilesystem: true
+            capabilities:
+              drop: ["ALL"]
+          volumeMounts:
+            # Next.js writes its fetch/image cache here; the rest of the filesystem is read-only.
+            - name: next-cache
+              mountPath: /app/.next/cache
+            - name: tmp
+              mountPath: /tmp
+      volumes:
+        - name: next-cache
+          emptyDir: {}
+        - name: tmp
+          emptyDir: {}
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: mg4-server
+  namespace: mg4
+  labels:
+    app.kubernetes.io/name: mg4-server
+    app.kubernetes.io/part-of: mg4
+spec:
+  selector:
+    app.kubernetes.io/name: mg4-server
+  ports:
+    - name: http
+      port: 80
+      targetPort: http