Only run on releases

Author: VisruthSK

.github/workflows/pkgdown.yaml

@@ -1,9 +1,6 @@
 # Workflow derived from https://github.com/r-lib/actions/tree/v2/examples
 # Need help debugging build failures? Start at https://github.com/r-lib/actions#where-to-find-help
 on:
-  push:
-    branches: [main, master]
-  pull_request:
   release:
     types: [published]
   workflow_dispatch:
@@ -15,9 +12,9 @@ permissions: read-all
 jobs:
   pkgdown:
     runs-on: ubuntu-latest
-    # Only restrict concurrency for non-PR jobs
     concurrency:
-      group: pkgdown-${{ github.event_name != 'pull_request' || github.run_id }}
+      group: pkgdown-${{ github.run_id }}
+      cancel-in-progress: true
     env:
       GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
     permissions: