Trick tests by cloning the to-be-tested checkout
Trick tests by cloning the to-be-tested checkout

Without this, the installer will pull & test current master to
/srv/mediawiki-containers, which defeats the purpose of testing.

wikimedia/mediawiki-containers,gwicke/mediawiki-containers,wikimedia/mediawiki-containers,gwicke/mediawiki-containers,wikimedia/mediawiki-containers,gwicke/mediawiki-containers