Wikimedia Bugzilla is closed!

Rather than having to manually update make-wmf-branch/default.conf (even more so now with the weekly branching and deployments), it'd be great if we could make the special extension versions a bit more dynamic if required.

Current:
$specialExtensions = array(
	'DataValues' => 'mw1.22-wmf5',
	'Diff' => 'mw1.22-wmf5',
	'Wikibase' => 'mw1.22-wmf5',
);

New?

$specialExtensions = array(
	'DataValues' => 'mw-$wgVersion',
	'Diff' => 'mw-$wgVersion',
	'Wikibase' => 'mw-$wgVersion',
);

$wgVersion can be replaced inline by the code.

I'm not sure of the best way to lay this out.. Wikidata have been using a hyphen in the middle, which doesn't work so well with how $wgVersion currently is. Could we swap to say mw-1.22wmf5 via mw-$wgVersion? Or should try and support the current? Maybe with a major and a minor (major being 1.22, minor being wmf5) etc