Create links if bug number added to PR title after creation

[edmorley]

Currently only the opened event is listened to, which means the attachment isn't created if the bug number is only added after the PR is created (as has happened a few times for Treeherder PRs):

github-bugzilla-pr-linker/app/app.py

Lines 104 to 108 in 89c2a4a

	if posted.get('action') != 'opened': # only created PRs
	logger.warning("Action was NOT 'opened'. It was {!r}".format(
	posted.get('action')
	))
	return 'OK'

[peterbe]

I suspect the reason I made it only trigger on posted.get('action') != 'opened' is because that's an action that can only happen once. If it happens on every action of a PR, we'd first need to query Bugzilla to see if there are any existing attachments, that are links to the current PR.

[peterbe]

Actually, we already have code in place to make sure we don't add the attachment comment again.
See

github-bugzilla-pr-linker/app/app.py

Lines 131 to 137 in 3b020f7

	for i, comment in enumerate(bug_comments):
	if comment.get("is_obsolete"):
	continue
	if url in comment["text"]:
	# exit early!
	logger.info(f"Pull request URL already in comment {i+1}")
	return

WIth that in mind I don't see a reason to remove the if posted.get('action') != 'opened': check.