Gancio broken after docker-update due to Postgres version

After updating the docker installation I found Gancio not working anymore. Finally I found this was down to the fact that the Postgres container was updated to postgres 16 and did not work with the previous database.

I'd propose to change the docker-compose file for Postgres to

image: postgres:15

to avoid this issue for people upgrading a running version with Postgres as database.