Automate committing compiled plug back to repo

.github/workflows/publish.yml

@@ -22,6 +22,18 @@ jobs:
       - name: Build Plug
         run: deno task build
 
+      - name: Commit and push changes
+        run: |
+          git config --local user.email "action@github.com"
+          git config --local user.name "GitHub Action"
+          git add icalendar.plug.js
+          if git diff --quiet && git diff --staged --quiet; then
+            echo "No changes to commit"
+          else
+            git commit -m "Build and update icalendar.plug.js [skip ci]"
+            git push
+          fi
+
       - name: Upload Build Artifact
         uses: actions/upload-artifact@v4
         with: