ci: add forgejo action

.forgejo/workflows/build-container.yaml

@@ -0,0 +1,28 @@
+name: Build and push Docker image
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  build-and-publish:
+    runs-on: docker
+    steps:
+      - uses: actions/checkout@v3
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+        with:
+          driver: docker
+      - name: Set up Docker Buildx
+        uses: docker/login-action@v2
+        with:
+          registry: ${{ secrets.DOCKER_REGISTRY }}
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+      - name: Build and push
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          push: true
+          tags: ${{ secrets.DOCKER_REGISTRY }}/Hamcha/staxman:latest