ci: add docker image push

.github/workflows/ci.yml

@@ -5,11 +5,16 @@ on:
   push:
     branches:
       - main
+    tags:
+      - "v*"
 
 concurrency:
   group: ci-${{ github.workflow }}-${{ github.ref }}
   cancel-in-progress: true
 
+permissions:
+  contents: read
+
 jobs:
   backend:
     name: Backend tests
@@ -88,6 +93,7 @@ jobs:
   docker:
     name: Docker build
     runs-on: ubuntu-latest
+    if: ${{ !startsWith(github.ref, 'refs/tags/') }}
     needs:
       - backend
       - frontend
@@ -108,3 +114,53 @@ jobs:
           tags: upopoy:ci
           cache-from: type=gha
           cache-to: type=gha,mode=max
+
+  docker-push:
+    name: Docker image publish
+    runs-on: ubuntu-latest
+    if: ${{ startsWith(github.ref, 'refs/tags/') }}
+    needs:
+      - backend
+      - frontend
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Prepare image name
+        id: image
+        shell: bash
+        run: echo "name=ghcr.io/${GITHUB_REPOSITORY,,}" >> "$GITHUB_OUTPUT"
+
+      - name: Extract Docker metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ steps.image.outputs.name }}
+          tags: |
+            type=ref,event=tag
+            type=sha,prefix=sha-
+
+      - name: Log in to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build application image
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          file: Dockerfile
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max