This can happen if `machine.pgroonga` is set during initial
installation. We cannot run `CREATE EXTENSION PGROONGA` because the
database that we need to run that statement in does not exist yet;
make the command a silent no-op that does not create the
`pgroonga_setup.sql.applied` flag file, such that a later
`zulip-puppet-apply` once the database exists can pick up and install
the extension.
2057057be4