[FIX] Pull the postgresql image again just in case the cleaner deleted it before the CI.

Some time the autoclean is excuted just before the CI have time to run the tests in which case an exception is shown, now we pull the image just before the postgresql container is created to avoid this.
A better message is shown just in case the postgresql image is now properly set.
1 job for master-fix_noimage_exception-truiz in 26 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Test
passed #304891
lint
test_install

00:00:26