Don't run pg-upgrade on GitLab 10.0 in docker
Running the upgrade actually attempts an upgrade.
Checking for an omnibus managed postgresql: OK
Checking if we already upgraded: NOT OK
Checking for a newer version of PostgreSQL to install: OK
Running the upgrade actually attempts an upgrade.
Checking for an omnibus managed postgresql: OK
Checking if we already upgraded: NOT OK
Checking for a newer version of PostgreSQL to install: OK