ci: public OpenAPI only for main branch & version tags

Author: zehnm

.github/workflows/openapi.yml

@@ -31,6 +31,7 @@ jobs:
 
   publish:
     name: Publish GitHub pages
+    if: github.ref == 'refs/heads/main' || contains(github.ref, 'tags/v')
     runs-on: ubuntu-latest
     needs: [ validate ]
     steps: