Add docker compose override file

[njogz]

Add a docker compose override file so that someone can override the default file in case certain ports are unavailable etc.

[samuelimoisili]

@njogz I think I handle this in ticket #37, but we can make it more elegant by using environment variables in the docker compose file.

[andrablaj]

@samuelimoisili 💯 for suggesting using environment variables in the docker compose file.