archwiki: LocalSettings.php: add gitlab.archlinux.org to wgGitRepositoryViewers

This way the commit hash for "MediaWiki" in https://wiki.archlinux.org/title/Special:Version is clickable.

roles/archwiki/templates/LocalSettings.php.j2

@@ -76,6 +76,7 @@ $wgRightsIcon = "$wgResourceBasePath/resources/assets/licenses/gnu-fdl.png";
 $wgResourceLoaderMaxQueryLength = -1;
 
 $wgGitRepositoryViewers['https://github.com/(.*?)(.git)?'] = 'https://github.com/$1/commit/%H';
+$wgGitRepositoryViewers['https://gitlab.archlinux.org/(.*?)(.git)?'] = 'https://gitlab.archlinux.org/$1/-/commit/%H';
 
 $wgJobRunRate = 0;
 $wgRunJobsAsync = 1;