only run tests if there are changes to go files

.gitea/workflows/tests.yml

@@ -7,6 +7,7 @@ on:
 jobs:
   tests:
     runs-on: ubuntu-latest
+    if: contains(github.event.pull_request.changed_files, '*.go')
     steps:
       - name: Checkout code
         uses: actions/checkout@v3