Include main branch in pull request target

Author: nargokul

.github/workflows/codebuild-ci.yml

@@ -3,6 +3,7 @@ on:
   pull_request_target:
       branches:
           - "master*"
+          - "main*"
 
 concurrency:
     group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.head_ref }}