Add Docker Support

[chriskewl]

Would be awesome if this could be added to a Docker for quick install then just move over your files.

[retrocomputacion]

@idolpx was working on a dockerized fork, dont' know if he's still at it.

[idolpx]

oh... I have things running in docker. I'll get it ready to share.

[idolpx]

This still needs some testing before submitting the PR.

https://github.com/idolpx/retrobbs/tree/staging-4pr

Let me know if you have any questions or find any issues.