perf: optimize CI build speed with smart caching

- Add Go module cache
- Add frontend download cache with commit SHA tracking
- Add Docker layer cache (registry-based)
- Cache will invalidate when frontend repo updates

Author: cyk

.github/workflows/test_docker.yml

@@ -35,9 +35,31 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v4
-      - uses: actions/setup-go@v5
+
+      - name: Setup Go
+        uses: actions/setup-go@v5
         with:
           go-version: '1.25.0'
+          cache: true
+          cache-dependency-path: go.sum
+
+      # 获取前端仓库的最新commit SHA
+      - name: Get Frontend Commit SHA
+        id: frontend-sha
+        run: |
+          FRONTEND_SHA=$(curl -s https://api.github.com/repos/${{ env.FRONTEND_REPO }}/commits/main | jq -r '.sha')
+          echo "sha=$FRONTEND_SHA" >> $GITHUB_OUTPUT
+          echo "Frontend repo latest commit: $FRONTEND_SHA"
+
+      # 缓存前端下载 - key包含前端仓库的commit SHA
+      - name: Cache Frontend
+        id: cache-frontend
+        uses: actions/cache@v4
+        with:
+          path: public/dist
+          key: frontend-${{ env.FRONTEND_REPO }}-${{ steps.frontend-sha.outputs.sha }}
+          restore-keys: |
+            frontend-${{ env.FRONTEND_REPO }}-
 
       # 即使只构建 x64，我们也需要 musl 工具链（因为 BuildDockerMultiplatform 默认会检查它）
       - name: Cache Musl
@@ -46,6 +68,7 @@ jobs:
         with:
           path: build/musl-libs
           key: docker-musl-libs-v2
+
       - name: Download Musl Library
         if: steps.cache-musl.outputs.cache-hit != 'true'
         run: bash build.sh prepare docker-multiplatform
@@ -57,7 +80,7 @@ jobs:
         run: bash build.sh beta docker-multiplatform
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-          FRONTEND_REPO: ${{ vars.FRONTEND_REPO }}
+          FRONTEND_REPO: ${{ env.FRONTEND_REPO }}
 
       - name: Upload artifacts
         uses: actions/upload-artifact@v4
@@ -77,7 +100,7 @@ jobs:
       packages: write
     strategy:
       matrix:
-        # 你可以选择只构建 latest，或者保留全部变体
+        # 构建所有变体
         image: ["latest", "ffmpeg", "aria2", "aio"]
         include:
           - image: "latest"
@@ -137,3 +160,5 @@ jobs:
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
           platforms: ${{ env.RELEASE_PLATFORMS }}
+          cache-from: type=registry,ref=${{ env.REGISTRY }}/${{ env.GHCR_ORG_NAME }}/${{ env.IMAGE_NAME }}:buildcache-${{ matrix.image }}
+          cache-to: type=registry,ref=${{ env.REGISTRY }}/${{ env.GHCR_ORG_NAME }}/${{ env.IMAGE_NAME }}:buildcache-${{ matrix.image }},mode=max