ci: publish to ghcr

.github/workflows/publish-ghcr.yml

@@ -0,0 +1,78 @@
+name: Publish GHCR Image
+
+on:
+  push:
+    tags:
+      - 'release-*'
+
+permissions:
+  contents: read
+  packages: write
+
+concurrency:
+  group: publish-ghcr-${{ github.ref }}
+  cancel-in-progress: false
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v4
+
+      - name: Set up Bun
+        uses: oven-sh/setup-bun@v2
+        with:
+          bun-version: 1.3.11
+
+      - name: Install dependencies
+        run: bun install --frozen-lockfile
+
+      - name: Run typecheck
+        run: bun run typecheck
+
+      - name: Run tests
+        run: bun run test
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log in to GHCR
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Derive image metadata
+        shell: bash
+        run: |
+          set -euo pipefail
+
+          version="${GITHUB_REF_NAME#release-}"
+          version="${version#v}"
+
+          if [[ -z "$version" ]]; then
+            echo "Release version is empty after stripping prefix from tag: $GITHUB_REF_NAME" >&2
+            exit 1
+          fi
+
+          image_name="ghcr.io/${GITHUB_REPOSITORY,,}"
+
+          {
+            echo "VERSION=$version"
+            echo "IMAGE_NAME=$image_name"
+          } >> "$GITHUB_ENV"
+
+      - name: Build and push image
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          file: ./Dockerfile
+          push: true
+          tags: ${{ env.IMAGE_NAME }}:${{ env.VERSION }}
+          labels: |
+            org.opencontainers.image.source=https://github.com/${{ github.repository }}
+            org.opencontainers.image.revision=${{ github.sha }}
+            org.opencontainers.image.version=${{ env.VERSION }}