We have tiny-container-build jenkins job available on 18.03 but not
available on 18.06.

Here are the changes to bump the build for 18.06 in master branch.

Signed-off-by: Andrew Lee (李健秋) <andrew.lee@collabora.co.uk>
Reviewed-by: Emanuele Aina <emanuele.aina@collabora.com>
Differential Revision: https://phabricator.apertis.org/D7832