Merge pull request #731 from rhmdnd/fix-test-broken-content-workflow

CMP-3138: Only build broken test content on master

Author: rhmdnd

.github/workflows/test-broken-content-latest.yml

@@ -1,5 +1,7 @@
 on:
   push:
+    branches:
+      - master
     paths:
       - "images/testcontent/**"
       - ".github/workflows/test-broken-content-latest.yml"