deploy to gh pages only or push/merge to master

.github/workflows/deploy-demo.yml

@@ -1,7 +1,12 @@
 name: Build and deploy demo
-on: [push]
+
+on:
+  push:
+    branches: [master] # It will also trigger on PR merges to master
+
 permissions:
   contents: write
+
 jobs:
   build-and-deploy-demo:
     name: Build and deploy demo
@@ -14,13 +19,10 @@ jobs:
       - uses: actions/setup-node@v4
         with:
           node-version: 18.x
-
       - name: Install
         run: yarn
-
       - name: Build
         run: yarn build
-
       - name: Deploy
         uses: JamesIves/github-pages-deploy-action@v4
         with: