Add test suite with PostgreSQL 10 to be run on a schedule
Add test suite with PostgreSQL 10 to be run on a schedule

Also, move MySQL tests to run only on master branch, and on schedules.

Signed-off-by: Balasankar "Balu" C <250a398eb3bfb9862062144cc742cc8f9bdd8d78@gitlab.com>

stoplightio/gitlabhq,mmkassem/gitlabhq,mmkassem/gitlabhq,mmkassem/gitlabhq,iiet/iiet-git,stoplightio/gitlabhq,iiet/iiet-git,iiet/iiet-git,stoplightio/gitlabhq,iiet/iiet-git,mmkassem/gitlabhq,stoplightio/gitlabhq