Values:
COMMENTS_DISABLED (0):
Do not require comments on Pull Requests
before builds are triggered.
COMMENTS_ENABLED (1):
Enforce that repository owners or
collaborators must comment on Pull Requests
before builds are triggered.
COMMENTS_ENABLED_FOR_EXTERNAL_CONTRIBUTORS_ONLY (2):
Enforce that repository owners or
collaborators must comment on external
contributors' Pull Requests before builds are
triggered.