feat(ci): add build-image job to release workflow

.gitea/workflows/release.yml

@@ -31,3 +31,28 @@ jobs:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           GITEA_TOKEN: ${{ secrets.GITEA_TOKEN }}
 
+  build-image:
+    needs: release
+    runs-on: ubuntu-latest
+    name: Build Docker Image
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0 # Ensure full history is available
+      - name: Extract tag
+        run: |
+          TAG=$(git describe --tags --abbrev=0)
+          echo "TAG=$TAG" >> $GITHUB_ENV
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Build Image
+        run: docker buildx build -f backend/.docker/Dockerfile -t git.kjan.de/szut/casino-backend:${{ env.TAG }} -t git.kjan.de/szut/casino-backend:latest backend
+      - name: Login
+        uses: docker/login-action@v3
+        with:
+          registry: git.kjan.de
+          username: ${{ secrets.DOCKER_USER }}
+          password: ${{ secrets.DOCKER_PASS }}
+      - name: Push
+        run: docker push git.kjan.de/szut/casino-backend:latest