Update release-preview.yml

Author: egil

.github/workflows/release-preview.yml

@@ -16,7 +16,7 @@ on:
 
 jobs:
   release-preview:
-    if: github.event_name == 'workflow_dispatch' || github.ref == 'refs/heads/main' && ${{ github.event.workflow_run.conclusion == 'success' }}
+    if: github.event_name == 'workflow_dispatch' || ( github.ref == 'refs/heads/main' && ${{ github.event.workflow_run.conclusion == 'success' }} )
     runs-on: ubuntu-latest
     steps: