ci: build + push Docker image to ghcr.io on master/tags

.github/workflows/ci.yml

@@ -40,3 +40,42 @@ jobs:
 
       - name: test
         run: cargo test
+
+  docker:
+    name: Build & Push Docker Image
+    runs-on: ubuntu-latest
+    needs: ci
+    if: github.ref == 'refs/heads/master' || startsWith(github.ref, 'refs/tags/v')
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Log in to GHCR
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Docker metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ghcr.io/${{ github.repository }}
+          tags: |
+            type=raw,value=latest,enable={{is_default_branch}}
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=sha,prefix=
+
+      - name: Build and push
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          build-args: FEATURES=sqlite,sqlite-federation