chore(ci): only run web-test-runner tests on push to release branches

will still run on other branches if there's a PR open

Author: wjhsf

.github/workflows/web-test-runner.yml

@@ -2,6 +2,12 @@ name: Run Web Test Runner integration tests
 
 on:
     push:
+        branches:
+            - master
+            - release
+            - 'spring*'
+            - 'summer*'
+            - 'winter*'
     pull_request:
 
 env: