Keep in mind that this might become problematic for folks that are running Postgres inside Docker on macOS or Windows, as IO performance is quite poor.
I put together a up / down migration validation system a while ago (start up two databases, apply all-1 up migrations on A and all up migrations + final down migration on B) for a pretty sizable schema.
Folks that were using Docker had to wait upwards of two minutes, while natively installed Postgres would finish in under 10sec.