fix(ci): clone repository explicitly in gitea workflow

.gitea/workflows/ci.yml

@@ -11,11 +11,20 @@ jobs:
   verify:
     runs-on: ubuntu-latest
     env:
-      WORKSPACE_DIR: ${{ github.workspace }}
+      WORKSPACE_DIR: ${{ github.workspace }}/repo
+      REPO_URL: ${{ github.server_url }}/${{ github.repository }}.git
+      REPO_SHA: ${{ github.sha }}
     steps:
+      - name: Checkout repository
+        run: |
+          rm -rf "$WORKSPACE_DIR"
+          git clone --depth 1 "$REPO_URL" "$WORKSPACE_DIR"
+          cd "$WORKSPACE_DIR"
+          git fetch --depth 1 origin "$REPO_SHA"
+          git checkout "$REPO_SHA"
+
       - name: Verify Go toolchain
         run: |
-          echo "$WORKSPACE_DIR"
           cd "$WORKSPACE_DIR"
           go version
           pwd