update pkgdown GHA (#1127)

.github/workflows/pkgdown.yaml

@@ -1,10 +1,6 @@
-# Workflow derived from https://github.com/r-lib/actions/tree/master/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:
-    branches: [main, master]
+    branches: main
   release:
     types: [published]
   workflow_dispatch:
@@ -31,8 +27,14 @@ jobs:
           extra-packages: any::pkgdown, local::.
           needs: website
 
-      - name: Deploy package
-        run: |
-          git config --local user.name "$GITHUB_ACTOR"
-          git config --local user.email "[email protected]"
-          Rscript -e 'pkgdown::deploy_to_branch(new_process = FALSE)'
+      - name: Build site
+        run: pkgdown::build_site_github_pages(new_process = FALSE, install = FALSE)
+        shell: Rscript {0}
+
+      - name: Deploy to GitHub pages 🚀
+        if: github.event_name != 'pull_request'
+        uses: JamesIves/[email protected]
+        with:
+          clean: false
+          branch: gh-pages
+          folder: docs