feat: 添加GitHub Actions工作流构建Docker镜像

- 添加一个新的GitHub Actions工作流以构建和推送Docker镜像。

docker/example.yaml

@@ -0,0 +1,26 @@
+on:
+  workflow_dispatch:
+
+env:
+  DOCKER_REGISTRY: git.furtherverse.com
+  IMAGE_NAME: ${{ github.repository }}
+
+jobs:
+  build-image:
+    runs-on: ubuntu-latest-amd64
+  
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v4
+    
+    - <<: *docker-setup-buildx
+
+    - <<: *docker-login
+
+    - name: Build and push
+      uses: docker/build-push-action@v6
+      with:
+        context: .
+        file: docker/Dockerfile
+        push: true
+        tags: ${{ env.DOCKER_REGISTRY }}/${{ env.IMAGE_NAME }}:latest-${{ env.ARCH }}