fix: git checkout

.github/workflows/build-singbox-docker.yml

@@ -16,16 +16,16 @@ jobs:
         distro: [alpine, distroless]
     runs-on: ubuntu-latest
     steps:
-      - name: Checkout Action Repo
-        uses: actions/checkout@v3
-        with:
-          path: action
       - name: Checkout Source Code of 'SagerNet/sing-box'
         uses: actions/checkout@v3
         with:
           repository: 'SagerNet/sing-box'
           ref: ${{ github.event.inputs.tag }}
           submodules: true
+      - name: Checkout Action Repo
+        uses: actions/checkout@v3
+        with:
+          path: action
       - name: Setup Docker Buildx
         uses: docker/setup-buildx-action@v2
       - name: Setup QEMU for Docker Buildx