feat: Crumbs by Bretzel — self-hostable notes app MVP

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

.github/workflows/release.yml

@@ -0,0 +1,54 @@
+name: Release
+
+on:
+  push:
+    tags:
+      - 'v*'
+
+permissions:
+  contents: write
+  packages: write
+
+jobs:
+  ci:
+    uses: ./.github/workflows/ci.yml
+
+  release:
+    name: Build & Push Docker Image
+    runs-on: ubuntu-latest
+    needs: ci
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Extract version from tag
+        id: version
+        run: echo "VERSION=${GITHUB_REF#refs/tags/}" >> $GITHUB_OUTPUT
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to Container Registry
+        if: env.REGISTRY_URL != ''
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ secrets.REGISTRY_URL }}
+          username: ${{ secrets.REGISTRY_USER }}
+          password: ${{ secrets.REGISTRY_TOKEN }}
+        env:
+          REGISTRY_URL: ${{ secrets.REGISTRY_URL }}
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          push: ${{ secrets.REGISTRY_URL != '' }}
+          tags: |
+            ${{ secrets.REGISTRY_URL && format('{0}/crumbs:{1}', secrets.REGISTRY_URL, steps.version.outputs.VERSION) || '' }}
+            ${{ secrets.REGISTRY_URL && format('{0}/crumbs:latest', secrets.REGISTRY_URL) || '' }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+
+      - name: Create GitHub Release
+        uses: softprops/action-gh-release@v2
+        with:
+          generate_release_notes: true