pg-upgrade does not support with seperate machine for Geo tracking database

When gitlab-ctl pg-upgrade is ran on a Geo secondary it detects it needs to do special stuff (see geo_secondary_upgrade), which is great.

But I does not support running postgresql and geo-postgresql running on separate machines:

$ gitlab-ctl pg-upgrade
Checking for an omnibus managed postgresql: NOT OK
No currently installed postgresql in the omnibus instance found.

To be able to update the tracking db (only tracking db), I had to temporary add postgresql['enable'] = true to gitlab.rb.

Secondary PostgreSQL node gitlab.rb

external_url 'http://secondary-ha-postgresql.gogitlab.ml'
roles ['postgres_role']
repmgr['enable'] = false
consul['enable'] = false
prometheus['enable'] = false
alertmanager['enable'] = false
pgbouncer_exporter['enable'] = false
redis_exporter['enable'] = false
gitlab_monitor['enable'] = false
postgresql['listen_address'] = '10.164.0.30'
postgresql['md5_auth_cidr_addresses'] = ['10.164.0.30/32', '10.164.0.31/32', '10.164.0.34/32', '10.164.0.35/32']
postgresql['hot_standby'] = 'on'
postgresql['sql_user_password'] = ''
gitlab_rails['db_password'] = ''
geo_postgresql['enable'] = false
gitlab_rails['auto_migrate'] = false
geo_secondary['auto_migrate'] = false
roles ['geo_secondary_role']

Secondary tracking database node gitlab.rb

external_url 'http://secondary-ha-tracking.gogitlab.ml'
geo_postgresql['enable'] = true
geo_postgresql['listen_address'] = '10.164.0.31'
geo_postgresql['sql_user_password'] = ''
geo_secondary['db_fdw'] = true
geo_postgresql['fdw_external_password'] = ''
geo_postgresql['md5_auth_cidr_addresses'] = ['10.164.0.30/32']
geo_postgresql['trust_auth_cidr_addresses'] = %w(10.164.0.34/32 10.164.0.35/32)
gitlab_rails['db_host'] = '10.164.0.30'
gitlab_rails['auto_migrate'] = false
alertmanager['enable'] = false
consul['enable'] = false
gitaly['enable'] = false
gitlab_monitor['enable'] = false
gitlab_workhorse['enable'] = false
nginx['enable'] = false
node_exporter['enable'] = false
pgbouncer_exporter['enable'] = false
postgresql['enable'] = true
prometheus['enable'] = false
redis['enable'] = false
redis_exporter['enable'] = false
repmgr['enable'] = false
sidekiq['enable'] = false
unicorn['enable'] = false
geo_secondary['auto_migrate'] = false
roles ['geo_secondary_role']