ci: Release only on tag set

.gitea/workflows/build.yaml

@@ -38,6 +38,7 @@ jobs:
         go-version: 1.21
     - name: Release artifact  
       id: use-go-action
+      if: startsWith(gitea.event.ref, 'refs/tags/v')
       uses: https://gitea.com/actions/release-action@main
       with:
         files: |-