ci(lint): improve CI configuration and readability

- Remove `fetch-depth: 0` from the checkout action
- Add blank lines for better readability in job steps

Signed-off-by: appleboy <appleboy.tw@gmail.com>

.github/workflows/testing.yml

@@ -10,19 +10,19 @@ jobs:
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4
-        with:
-          fetch-depth: 0
 
       - name: Setup go
         uses: actions/setup-go@v5
         with:
           go-version-file: go.mod
           check-latest: true
+
       - name: Setup golangci-lint
         uses: golangci/golangci-lint-action@v6
         with:
           version: latest
           args: --verbose
+
       - uses: hadolint/hadolint-action@v3.1.0
         name: hadolint for Dockerfile
         with: