Add CICD job to build Docker image

.gitea/workflows/push.yaml

@@ -84,3 +84,38 @@ jobs:
         uses: actions/checkout@v4
       - name: Run tailwindcss
         run: tailwindcss --input style/tailwind.css
+
+  docker-build:
+    runs-on: ubuntu-latest-docker
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+      - name: Login to Gitea container registry
+        uses: docker/login-action@v4
+        with:
+          registry: ${{ env.registry }}
+          username: ${{ env.actions_user }}
+          password: ${{ secrets.CONTAINER_REGISTRY_TOKEN }}
+      - name: Get Image Name
+        id: get-image-name
+        run: |
+          echo "IMAGE_NAME=$(echo ${{ env.registry }}/${{ gitea.repository }} | tr '[:upper:]' '[:lower:]')" >> $GITHUB_OUTPUT
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v6
+        with:
+          images: ${{ steps.get-image-name.outputs.IMAGE_NAME }}
+          tags: |
+            type=sha
+            type=ref,event=branch
+            type=raw,value=latest,enable={{is_default_branch}}
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v7
+        with:
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max