Update test-runner-ci.yaml

Signed-off-by: Tyler Titsworth <tyler.titsworth@intel.com>

Author: Tyler Titsworth

.github/workflows/test-runner-ci.yaml

@@ -17,7 +17,9 @@ on:
   pull_request:
     paths:
     - 'test-runner/**'
-  push: null
+  push:
+    branches:
+    - main
 permissions: read-all
 concurrency:
   group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}