Add Docker build files and instructions

[avioletheart]

No description provided.

[Oliveriver]

I'm unfortunately hitting an error trying to run this. The database and front end start ok but the back end fails to start with the following error:

exec /app/docker-entrypoint.sh: no such file or directory

[Oliveriver]

Ok, fixed the issue by changing docker-entrypoint.sh to use LF instead of CRLF. But considering this appears to be broken for anyone who has the Windows line ends setting in Git (which may be many people), I can't merge this in its current state.

Can the contents of that file be put in Dockerfile to avoid this conflict altogether?

[avioletheart]

@Oliveriver i added .gitattributes which should fix the issue, can you check if that's the case? i don't have a windows machine to test on

[Oliveriver]

My concern with this change is that it changes most people's installation mechanism to use a system that I, the primary maintainer of the project, don't understand. I think it's great that it's possible to do and see no reason not to merge changes that enable it, but marking it as the recommended installation path is concerning to me.

[Oliveriver]

One other thing I almost forgot to mention: it takes some time after start-up for the database migrations to run and as far as the average user is concerned, they run silently. So ideally there should be an indication that the process is ongoing, or at least there should be an instruction to wait in the readme.