build container image in pipeline

.forgejo/workflows/build.yml

@@ -30,6 +30,37 @@ jobs:
       - name: Upload site artifact
         uses: forgejo/upload-artifact@v4
         with:
-          name: docs
+          name: docs.zip
           path: site/
           retention-days: 30
+
+  docker:
+    runs-on: ubuntu-latest
+    needs: build
+    container: catthehacker/ubuntu:act-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v6
+
+      - name: Download site artifact
+        uses: forgejo/download-artifact@v4
+        with:
+          name: docs.zip
+          path: site/
+
+      - name: Log in to Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ vars.CONTAINER_REGISTRY }}
+          username: ${{ secrets.CONTAINER_REGISTRY_USERNAME }}
+          password: ${{ secrets.CONTAINER_REGISTRY_TOKEN }}
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          push: true
+          tags: ${{ vars.CONTAINER_REGISTRY }}/servala/documentation:latest
+          cache-from: type=gha
+          cache-to: type=gha,mode=max