During upgrade, I was getting
Stopping PostgreSQL 15 database server: mainError: Config owner (postgres:101) and data owner (runit-log:999) do not match, and config owner is not root … failed!
failed!
could not open version file “/shared/postgres_data/PG_VERSION”: Permission denied
Failure, exiting
Which was solved by
sudo ./launcher enter app
and then
chown -R postgres:postgres /shared/postgres_data
chown -R postgres:postgres /shared/postgres_run
chmod -R 700 /shared/postgres_data