chore(build): re-enable builds on PR and restrict publish to master

.github/workflows/build.yml

@@ -1,4 +1,8 @@
-on: [push]
+on:
+  push:
+    branches:
+      - master
+  pull_request:
 
 jobs:
   build:
@@ -119,6 +123,7 @@ jobs:
       run: npm run test:e2e
 
   publish:
+    if: github.event_name	== 'push' && contains(github.ref, 'master')
     runs-on: ubuntu-latest
     needs: [build, integration, e2e]
     steps: