Add postgres.
Add postgres.

Wolfium/gitlab-ci-runner-centos,mfittko/gitlab-ci-runner,gitlabhq/gitlab-ci-runner,moos3/gitlab-ci-runner-centos,myrubapa/gitlab-ci-runner-centos,moos3/gitlab-ci-runner-centos,andrewmunsell/gitlab-ci-runner,myrubapa/gitlab-ci-runner-centos,cui-liqiang/gitlab-ci-runner,Wolfium/gitlab-ci-runner-centos,cui-liqiang/gitlab-ci-runner,andrewmunsell/gitlab-ci-runner,gitlabhq/gitlab-ci-runner,mfittko/gitlab-ci-runner