I was able to migrate a baremetal Mautic 6 to Dockerized Mautic 6 with this guide, thanks!
A minor issue was that my config/local.php settings file, which I tried to copy at first, contained extensive configuration settings, including paths that didn’t seem to work out of the box in the new docker container. I had to more or less re-configure the new system with that as a guide.
I also updated the console binary path according to the Mautic 6.x docker config:
Migrate:
docker compose exec mautic_web php /var/www/html/bin/console doctrine:migrations:migrate
Check status:
docker compose exec mautic_web php /var/www/html/bin/console doctrine:migrations:status
Clear Cache:
docker compose exec mautic_web php /var/www/html/bin/console cache:clear