Update run.sh to fix their crappy smtp implementation and use default php mail (using msmtp behind the hood)

Update Dockerfile to add msmtp tool, configure it from env var, and set it as default mailer for php

Update Dockerfile, back to previous, 3.3.11 is not master where ARGON2ID is handled without dovecot dependancy

customize pwd validation to remove the default mandatory 2 digits as noticed here https://gitlab.e.foundation/e/infra/production-server/-/issues/228