ci: 添加 GitHub Actions Docker 发布 workflow

为 Gitea→GitHub 镜像 + GitHub 镜像仓库场景准备 Docker 镜像
自动构建和发布流程。

触发条件:
  - push tag v*  (release 时打 tag 自动触发)
  - workflow_dispatch  (手动触发,可在 GitHub UI 测试)

构建:
  - 多平台:linux/amd64 + linux/arm64
  - 通过 QEMU + Buildx 跨架构构建
  - 推送到 ghcr.io/<github-user>/volcano-engine-tts-ui
  - 双标签:语义版本 + 短 commit hash
  - OCI labels 包含 version 和 revision

与之前 version 包配合:
  workflow 用 git describe --tags --always --dirty 算 VERSION
  (commit hash 类似),通过 --build-arg 传给 Dockerfile,
  Dockerfile 用 -ldflags 注入到 version.Version / version.Commit
  两个变量。最终 /health 端点返回构建时注入的真实版本信息。

前置条件(用户需自行完成):
  1. GitHub 建镜像仓库
  2. Gitea 配置 Push Mirror 到 GitHub(开启 Sync Tags)
  3. 仓库设为 Public(否则 GHCR 镜像默认 private)

.github/workflows/docker.yml

@@ -0,0 +1,65 @@
+name: Docker Publish
+
+on:
+  push:
+    tags:
+      - 'v*'
+  workflow_dispatch:  # 允许手动触发测试
+
+env:
+  REGISTRY: ghcr.io
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0  # 拉完整历史,git describe 能取到 tag
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to GHCR
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract version from git
+        id: version
+        run: |
+          echo "version=$(git describe --tags --always --dirty)" >> "$GITHUB_OUTPUT"
+          echo "commit=$(git rev-parse --short HEAD)" >> "$GITHUB_OUTPUT"
+
+      - name: Extract Docker metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ github.repository }}
+          tags: |
+            type=semver,pattern={{version}}
+            type=sha,format=short
+          labels: |
+            org.opencontainers.image.version=${{ steps.version.outputs.version }}
+            org.opencontainers.image.revision=${{ steps.version.outputs.commit }}
+
+      - name: Build and push
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          platforms: linux/amd64,linux/arm64
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          build-args: |
+            VERSION=${{ steps.version.outputs.version }}
+            COMMIT=${{ steps.version.outputs.commit }}