updated github actions

.github/workflows/build_and_deploy_to_gh_pages.yml

@@ -1,10 +1,15 @@
 name: Build and Deploy
-on: [push, pull_request]
+
+on:
+  push:
+    # Sequence of patterns matched against refs/tags
+    tags:
+      - 'v*' # Push events to matching v*, i.e. v1.0, v20.15.10
+
 jobs:
   build-and-deploy:
     runs-on: ubuntu-latest
     # Only build and deploy on versioned tags
-    if: github.event_name == 'push' && startsWith(github.event.ref, 'refs/tags/v')
     steps:
       - name: Checkout 🛎️
         uses: actions/[email protected] # If you're using actions/checkout@v2 you must set persist-credentials to false in most cases for the deployment to work correctly.