forgot to add checkout for this job

.github/workflows/prs.yml

@@ -16,6 +16,9 @@ jobs:
   tests:
     runs-on: ubuntu-latest
     steps:
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: 1
       - uses: actions/setup-go@v5
         with:
           go-version-file: 'go.mod'