Synchronize on servo's homu queue doesn't work

[jdm]

It leads to a URL that starts with https://build.servo.org:54856/callback and this times out. If I manually edit the URL to point to https://build.servo.org/homu/callback then it succeeds. It's not clear from the code where this base URL comes from.

[jdm]

From

homu/homu/html/queue.html

Lines 123 to 129 in 2ea53e7

	location = 'https://github.com/login/oauth/authorize' +
	'?client_id={{oauth_client_id}}' +
	'&scope=public_repo,admin:repo_hook' +
	'&state=' + encodeURIComponent(JSON.stringify({
	cmd: 'synch',
	repo_label: '{{repo_label}}',
	}));

I think there must be a oauth client secret somewhere which contains the old base url, but I'm not sure where.

[jdm]

I assume we're using the default based on https://developer.github.com/apps/building-oauth-apps/authorizing-oauth-apps/#redirect-urls.