BaseRef

- do: baseRef
  must_include:
     regex: 'master|feature-branch1'
     regex_flag: 'none' # Optional. Specify the flag for Regex. default is 'i', to disable default use 'none'
     message: 'Custom message...'
  must_exclude:
     regex: 'feature-branch2'
     regex_flag: 'none' # Optional. Specify the flag for Regex. default is 'i', to disable default use 'none'
     message: 'Custom message...'
  mediaType:  # Optional. Required by status.* events to enable the groot preview on some Github Enterprise servers
     previews: 'array'

Simple example:

- do: baseRef
  must_exclude:
    regex: 'master'
    message: 'Merging into repo:master is forbidden'

Example with groot preview enabled (for status.* events on some older Github Enterprise servers)

- do: baseRef
  must_include:
    regex: 'master|main'
    message: 'Auto-merging is only enabled for default branch'
  mediaType:
    previews:
      - groot

Supported Events:

'pull_request.*', 'pull_request_review.*', 'check_suite.*', status.*