allow to set root password during installation for tests

3 jobs for gitlab-v13.12 in 0 seconds
Status Job ID Name Coverage
  External
failed SlapOS.SoftwareReleases.IntegrationTest-alain

00:44:51

failed SlapOS.SoftwareReleases.IntegrationTest-alain

00:46:44

failed SlapOS.SoftwareReleases.IntegrationTest-alain

01:59:17