When using your image to migrate the databases, pg_hba.conf will be replaced using a version, which will not allow other hosts to connect using a password

this line is not included in the pg_hba.conf of the newly migrate DATA folder, lets assume pg11

host all all all md5

One can easily copy this file from pg10/data/pg_hba.conf to pg10/data/pg_hba.conf or just add the line i mentioned - but we might also consider mention this in the readme.

Without that, PG boots up just fine, the migratoin did work just fine - just no other service in the docker stack can use PG since they cannot connect to it :)