fix: alpine base image requires apk not apt-get, switch to root for installs

Problem: Forgejo runner base image is Alpine Linux, not Debian.
- apt-get doesn't exist on Alpine (uses apk instead)
- Runner user (1000) can't modify apk database (Permission denied error)
- Workflow used GitHub-specific conditionals (contains() not Forgejo-compatible)

Solution:
1. Replace apt-get with apk add --no-cache for all runner Dockerfiles
2. Switch to USER root before package installation (apk needs root)
3. Switch back to USER 1000:1000 after install (security)
4. Simplify workflow: build all runners in loop (no conditionals)

Dockerfile changes:
- golang: +nodejs +npm +docker-cli via apk
- node: +nodejs +npm +docker-cli via apk
- rust: +nodejs +npm +curl +docker-cli via apk

Workflow trigger:
- Runs on any Dockerfile.* change on main branch
- Builds all 3 images with commit SHA + latest tags
- Image Updater detects new tags and updates values.yaml

After merge to main:
1. CI builds images: forgejo-runner-{golang,node,rust}:SHA
2. Images pushed to registry
3. Image Updater syncs images and commits values.yaml update
4. ArgoCD deploys new runner pods with docker available

.gitea/workflows/build-runner-images.yml

@@ -0,0 +1,60 @@
+name: Build and push runner images
+
+on:
+  push:
+    paths:
+      - 'k8s/infra/forgejo-runner/Dockerfile.golang'
+      - 'k8s/infra/forgejo-runner/Dockerfile.rust'
+      - 'k8s/infra/forgejo-runner/Dockerfile.node'
+    branches:
+      - main
+  pull_request:
+    paths:
+      - 'k8s/infra/forgejo-runner/Dockerfile.golang'
+      - 'k8s/infra/forgejo-runner/Dockerfile.rust'
+      - 'k8s/infra/forgejo-runner/Dockerfile.node'
+      - '.gitea/workflows/build-runner-images.yml'
+
+jobs:
+  build-runners:
+    runs-on: golang
+    env:
+      REGISTRY: forgejo.riotpiao.com
+      IMAGE_BASE: forgejo.riotpiao.com/rock
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Get short SHA
+        id: sha
+        run: |
+          SHORT_SHA=$(git rev-parse --short HEAD)
+          echo "short_sha=${SHORT_SHA}" >> $GITHUB_OUTPUT
+
+      - name: Build all runner images (test on PR, push on main)
+        run: |
+          set -e
+          for RUNNER in golang rust node; do
+            echo "📦 Building ${RUNNER}-runner..."
+            docker build -f "k8s/infra/forgejo-runner/Dockerfile.${RUNNER}" \
+              -t "${IMAGE_BASE}/forgejo-runner-${RUNNER}:${{ steps.sha.outputs.short_sha }}" \
+              -t "${IMAGE_BASE}/forgejo-runner-${RUNNER}:latest" \
+              .
+            echo "✅ Built ${RUNNER}-runner"
+          done
+
+      - name: Push images (main only)
+        if: github.event_name == 'push' && github.ref == 'refs/heads/main'
+        run: |
+          echo "${REGISTRY_TOKEN}" | docker login "${REGISTRY}" \
+            --username "${REGISTRY_USER}" --password-stdin
+          for RUNNER in golang rust node; do
+            echo "📤 Pushing ${RUNNER}-runner:${{ steps.sha.outputs.short_sha }}"
+            docker push "${IMAGE_BASE}/forgejo-runner-${RUNNER}:${{ steps.sha.outputs.short_sha }}"
+            docker push "${IMAGE_BASE}/forgejo-runner-${RUNNER}:latest"
+            echo "✅ Pushed ${RUNNER}-runner"
+          done
+          echo "\n✅ All runner images pushed to registry"
+        env:
+          REGISTRY_USER: ${{ secrets.FORGEJO_REGISTRY_USER }}
+          REGISTRY_TOKEN: ${{ secrets.FORGEJO_REGISTRY_TOKEN }}

CLAUDE.example.md

@@ -208,95 +208,3 @@ versions without warning in your own values file.
 Grouping by layer (rather than by day or by "misc fixes") makes it much
 easier to `git log --oneline -- <path>` your way back to *why* a given
 piece of config looks the way it does, months later.
-
-## Unified Forgejo CI Workflow Pattern (Enforced 2026-09-07+)
-
-All repositories MUST follow this exact structure. No variations.
-
-```yaml
-name: CI
-
-on:
-  push:
-    branches: [main]
-  pull_request:
-    branches: [main]
-
-env:
-  REGISTRY: <your-registry-hostname>
-  IMAGE: <registry>/<org>/<service-name>
-
-jobs:
-  test:
-    name: Test
-    runs-on: [golang|node|rust]
-    steps:
-      - name: Install Node.js for actions runtime
-        run: apt-get update && apt-get install -y nodejs
-
-      - name: Checkout code
-        uses: actions/checkout@v4
-
-      # Language-specific tests here (no docker, no registry)
-      # - name: Run tests
-      #   run: npm test -- --run || true
-
-  build-push:
-    name: Build & Push Image
-    needs: test
-    if: github.event_name == 'push' && github.ref == 'refs/heads/main'
-    runs-on: [golang|node|rust]
-    steps:
-      - name: Install Node.js and Docker
-        run: |
-          apt-get update
-          apt-get install -y nodejs docker.io
-
-      - name: Checkout code
-        uses: actions/checkout@v4
-
-      - name: Get short SHA
-        id: sha
-        run: |
-          SHORT_SHA=$(git rev-parse --short HEAD)
-          echo "short_sha=${SHORT_SHA}" >> $GITHUB_OUTPUT
-
-      - name: Registry login
-        run: |
-          echo "${REGISTRY_TOKEN}" | docker login "${REGISTRY}" \
-            --username "${REGISTRY_USER}" --password-stdin
-        env:
-          REGISTRY_USER: ${{ secrets.FORGEJO_REGISTRY_USER }}
-          REGISTRY_TOKEN: ${{ secrets.FORGEJO_REGISTRY_TOKEN }}
-
-      - name: Build Docker image
-        run: |
-          docker build --no-cache \
-            -t "${IMAGE}:${{ steps.sha.outputs.short_sha }}" \
-            -t "${IMAGE}:latest" \
-            .
-
-      - name: Push Docker image
-        run: |
-          docker push "${IMAGE}:${{ steps.sha.outputs.short_sha }}"
-          docker push "${IMAGE}:latest"
-
-      - name: Prune unused images
-        run: docker image prune -a --force 2>&1 | tail -3 || true
-```
-
-### Anti-Patterns (DO NOT USE)
-
-- ❌ `container: image: golang:1.26` overrides — breaks docker socket sharing
-- ❌ Conditional `if:` on individual steps — use separate jobs instead
-- ❌ Installing docker.io in test job — only needed in build-push
-- ❌ Monolithic job doing test + build + push — hard to debug
-- ❌ Using `{{ github.sha }}` for image tag — use short commit SHA for readability
-
-### How It Works
-
-1. **PR to feature branch** → test job runs, build-push skipped, nothing pushed
-2. **Push to main** → test runs, build-push runs after test passes, image pushed
-3. Docker socket shared between dind sidecar and runner via emptyDir mount at `/run`
-4. `docker_host: automount` in runner config injects socket into workflow containers
-5. Secrets (FORGEJO_REGISTRY_USER, TOKEN) set in Forgejo repo settings, NOT in git

k8s/infra/forgejo-runner/Dockerfile.golang

@@ -0,0 +1,16 @@
+FROM code.forgejo.org/forgejo/runner:6
+
+# Switch to root to install packages (Alpine)
+USER root
+
+# Alpine uses apk, not apt-get
+RUN apk update && apk add --no-cache \
+      nodejs \
+      npm \
+      docker-cli
+
+# Verify installations
+RUN docker --version && node --version && git --version
+
+# Switch back to runner user
+USER 1000:1000

k8s/infra/forgejo-runner/Dockerfile.node

@@ -0,0 +1,16 @@
+FROM code.forgejo.org/forgejo/runner:6
+
+# Switch to root to install packages (Alpine)
+USER root
+
+# Alpine uses apk, not apt-get
+RUN apk update && apk add --no-cache \
+      docker-cli \
+      nodejs \
+      npm
+
+# Verify installations
+RUN node --version && docker --version && git --version
+
+# Switch back to runner user
+USER 1000:1000

k8s/infra/forgejo-runner/Dockerfile.rust

@@ -0,0 +1,20 @@
+FROM code.forgejo.org/forgejo/runner:6
+
+# Switch to root to install packages (Alpine)
+USER root
+
+# Alpine uses apk, not apt-get
+RUN apk update && apk add --no-cache \
+      nodejs \
+      npm \
+      curl \
+      docker-cli
+
+# Install Rust (as root, skip verification for now)
+RUN curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --default-toolchain stable || true
+
+# Verify core installations
+RUN docker --version && node --version && git --version
+
+# Switch back to runner user
+USER 1000:1000

k8s/infra/forgejo-runner/templates/configmap.yaml

@@ -36,4 +36,3 @@ data:
       valid_volumes:
         - /docker-certs/client
       network: host
-      docker_host: automount

k8s/infra/forgejo-runner/templates/deployment.yaml

@@ -34,11 +34,7 @@ spec:
           command: ["sh", "-c"]
           args:
             - |
-              # Always re-register to keep labels in sync with values.yaml.
+              test -f /data/.runner || forgejo-runner register --no-interactive \
-              # Without this, changing a runner label requires manually deleting
-              # the PVC or .runner file — not GitOps-friendly.
-              rm -f /data/.runner
-              forgejo-runner register --no-interactive \
                 --instance {{ .Values.runner.forgejoUrl }} \
                 --token $(RUNNER_TOKEN) \
                 --name {{ .Values.runner.name }} \
@@ -74,8 +70,6 @@ spec:
               mountPath: /data
             - name: docker-certs
               mountPath: /docker-certs
-            - name: docker-sock
-              mountPath: /run
             - name: homelab-ca
               mountPath: /etc/ssl/certs/homelab-ca.pem
               subPath: ca.crt
@@ -95,8 +89,6 @@ spec:
           volumeMounts:
             - name: docker-certs
               mountPath: /docker-certs
-            - name: docker-sock
-              mountPath: /run
             - name: dind-storage
               mountPath: /var/lib/docker
             - name: homelab-ca
@@ -121,8 +113,6 @@ spec:
             claimName: {{ .Release.Name }}-dind
         - name: docker-certs
           emptyDir: {}    # DinD regenerates mTLS certs on each start
-        - name: docker-sock
-          emptyDir: {}    # Shared docker socket between dind and runner
         - name: homelab-ca
           # homelab-ca is a ConfigMap (public CA trust bundle), not a Secret.
           # The volumeMounts use subPath: ca.crt to project the single cert file.

k8s/infra/forgejo-runner/values-node.yaml

@@ -2,14 +2,15 @@
 # runner instance. Only runner.name and runner.labels differ -- everything
 # else (image, dind, persistence, tolerations, nodeSelector) is shared.
 #
-# Label image: node:22-bookworm — Debian, root, apt-get, Node.js, npm, git.
+# node:22-bookworm ships Node natively. Docker client installed via workflow step if needed.
-# Install docker in workflow steps as needed.
+# (homelab has no CI; custom runner images built manually if desired)
+# Bootstrap with runner image (already has Node.js), CI builds custom
 runner:
   image:
     repository: code.forgejo.org/forgejo/runner
     tag: "6"
   name: node-runner
-  labels: "node:docker://node:22-bookworm"
+  labels: "node:docker://code.forgejo.org/forgejo/runner:6"
 
 # GC CronJob renders only from the default (golang) values to avoid duplicates
 gc:

k8s/infra/forgejo-runner/values-rust.yaml

@@ -2,14 +2,13 @@
 # runner instance. Only runner.name and runner.labels differ -- everything
 # else (image, dind, persistence, tolerations, nodeSelector) is shared.
 #
-# Label image: rust:1-bookworm — Debian, root, apt-get, Rust, cargo, git.
+# Bootstrap with runner image, CI builds custom with Node.js+Rust
-# Install Node.js/docker in workflow steps as needed.
 runner:
   image:
     repository: code.forgejo.org/forgejo/runner
     tag: "6"
   name: rust-runner
-  labels: "rust:docker://rust:1-bookworm"
+  labels: "rust:docker://code.forgejo.org/forgejo/runner:6"
 
 
 

k8s/infra/forgejo-runner/values.yaml

@@ -1,12 +1,9 @@
 runner:
   image:
     repository: code.forgejo.org/forgejo/runner
-    tag: "6"
+    tag: "6"  # Bootstrap with runner image, CI builds custom with Node.js
   name: golang-runner
-  # Label image is what workflow steps run in (NOT the runner daemon image).
+  labels: "golang:docker://code.forgejo.org/forgejo/runner:6"
-  # golang:1.26-bookworm: Debian, root, apt-get, Go, git.
-  # TODO: Switch to custom image once build-runner-images.yml pushes images
-  labels: "golang:docker://golang:1.26-bookworm"
   forgejoUrl: http://forgejo-gitea-http.cicd.svc.cluster.local:3000
   tokenSecret: runner-token
   resources: