ci: checkout workaround

actions/checkout#448

Author: genofire

.github/workflows/ci.yml

@@ -53,6 +53,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v2
+      with:
+        fetch-depth: 0
     - uses: actions/setup-go@v2
     - name: Install swag
       run: go get -u github.com/swaggo/swag/cmd/swag