Create Tests for samba

[bob5ec]

• [x] Create samba client container
• [x] create test users
• [x] Set up test compose file along with #55 from prod
• [x] create authenticated connect test
• [ ] Make containers configurable via VARs

[bob5ec]

We try out configuration via VARs next time. Not sure if it is convinient to store secrets in VARs.