Fix CI issue on master branches

toolset/github_actions/github_actions_diff.py

@@ -58,15 +58,13 @@ def quit_diffing():
 
 curr_branch = ""
 is_PR = (os.getenv("PR_NUMBER") != "")
-# BRANCH_NAME is the the name of the branch
-is_master = os.getenv("BRANCH_NAME") == "master"
 previous_commit = os.getenv("PREVIOUS_COMMIT")
 
 if is_PR:
     curr_branch = "HEAD"
     # Also fetch master to compare against
     subprocess.check_output(['bash', '-c', 'git fetch origin master:master'])
-elif not is_master:
+else:
     curr_branch = os.getenv("GITHUB_SHA")
 
 diff_target = "master" if is_PR else previous_commit