fix: clean up GitHub Actions workflows

- Enable GHA build cache across all workflows (replace no-cache: true)
- Add [skip ci] guard to build-and-push to prevent duplicate latest
  builds during releases
- Remove dead serverless branch trigger and build-routing-proxy job
- Remove unused id-token: write permission
- Add branch guard and contents: read permission to quick-fix workflow
- Fix release notes heredoc indentation so markdown renders correctly
- Fix git describe to use HEAD~1 for accurate changelog after version bump

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.github/workflows/build-and-push.yaml

@@ -4,7 +4,6 @@ on:
   push:
     branches:
       - main
-      - 'feature/serverless-*'  # Build development images for serverless features
   pull_request:
     branches:
       - main
@@ -17,10 +16,12 @@ env:
 jobs:
   build-and-push:
     runs-on: ubuntu-latest
+    if: >-
+      github.event_name != 'push'
+      || !contains(github.event.head_commit.message, '[skip ci]')
     permissions:
       contents: read
       packages: write
-      id-token: write
 
     steps:
       - name: Checkout repository
@@ -55,50 +56,6 @@ jobs:
           push: ${{ github.event_name != 'pull_request' }}
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
-          no-cache: true
-          platforms: linux/amd64
-
-  # Build routing proxy image for serverless features
-  build-routing-proxy:
-    runs-on: ubuntu-latest
-    # Only build routing proxy for serverless feature branches
-    if: github.ref == 'refs/heads/feature/serverless-2.0.0' && github.event_name != 'pull_request'
-    permissions:
-      contents: read
-      packages: write
-      id-token: write
-
-    steps:
-      - name: Checkout repository
-        uses: actions/checkout@v6
-
-      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
-
-      - name: Log in to GitHub Container Registry
-        uses: docker/login-action@v3
-        with:
-          registry: ${{ env.REGISTRY }}
-          username: ${{ github.actor }}
-          password: ${{ secrets.GITHUB_TOKEN }}
-
-      - name: Extract metadata for routing proxy
-        id: meta-proxy
-        uses: docker/metadata-action@v5
-        with:
-          images: ${{ env.REGISTRY }}/cpfarhood/devcontainer-routing-proxy
-          tags: |
-            type=raw,value=latest
-            type=raw,value=2.0.0-dev
-            type=sha,prefix=sha-
-
-      - name: Build and push routing proxy image
-        uses: docker/build-push-action@v6
-        with:
-          context: ./serverless/routing-proxy
-          push: true
-          tags: ${{ steps.meta-proxy.outputs.tags }}
-          labels: ${{ steps.meta-proxy.outputs.labels }}
           cache-from: type=gha
           cache-to: type=gha,mode=max
           platforms: linux/amd64