ci: sync gh-pages with main on every push

Signed-off-by: danbugs <danilochiarlone@gmail.com>

Author: danbugs

.github/workflows/sync-gh-pages.yml

@@ -0,0 +1,27 @@
+name: Sync gh-pages with main
+
+on:
+  push:
+    branches: [main]
+
+concurrency:
+  group: sync-gh-pages
+  cancel-in-progress: true
+
+jobs:
+  sync:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          ref: gh-pages
+          fetch-depth: 0
+
+      - name: Merge main into gh-pages
+        run: |
+          git config user.name "github-actions[bot]"
+          git config user.email "github-actions[bot]@users.noreply.github.com"
+          git merge origin/main -m "sync: merge main into gh-pages"
+          git push origin gh-pages