Updating underlying (and outdated) docker image

[borez]

Hi,

Realised that the underlying docker image (dperson) has not been updated, with the old version having security vulnerabilities.
dperson/samba#393

Replaced the old docker image with this one and it works OOB. You'll have to manually remove the old docker image, pull the new one, and amend the .sh file to reference to /unixfox/samba

https://quay.io/repository/unixfox/samba