FR: configure all parameters by environment variables in docker

[pplmx]

Maybe like this: https://github.com/tiredofit/docker-self-service-password

[coudot]

From my point of view, it's better to mount the config.inc.local.php file. Else you need to define new env var every time a new configuration parameter is added to the software

[pplmx]

Maybe it would be even better to support minimally configured by environment variables, such as ldap connection settings