Create Dockerfile

[0x3333]

Create a Dockerfile to run in a container. Need to check how to handle smbpasswd from inside the container.

[ajabep]

It's possible to change a password from another container using the smbpasswd -r and -U options and using a network binding :)
However, when an account password is expired, it's no longer possible to change it remotely. (see https://lists.samba.org/archive/samba/2014-October/186220.html ; I experienced the same issue nowadays).

It should also be fine to change the password by binding the same volumes, but, I need to check it. However, (1) smbpasswd needs to be run using root user, (2) it does not check the old password and (3) it requires BOTH the database (in /var/lib/samba) and the configuration (in /etc/samba).