Add Dockerfile to run ukulele in Docker Container

[Nanabell]

Pretty simple Dockerfile to build a ukulele Docker Image.

• Does not run as root in the container (uid 999)
• Able to set Config entries with env vars
  • Could also include an example how to mount the config file so you can change settings between restarts and dont need to re-deploy
• Able to mount database file to host for persistence

Wrote the documentation in mind with ukulele being uploaded to dockerhub but thats obviously not a todo i can do. Alternatively i can add the build command & a Dockerfile that will build the project inside a container so endusers wont need java 11 installed.

[freyacodes]

It would be easy for me to add a docker build to my CI server. Though would it not be easier to provide a docker-compose file instead of several command options?

At any rate, I don't think we should be recommending options that don't use volumes for configuration and persistence.

[Nanabell]

i can include a docker-compose.yml file as well sure, keept it on cli since you have to create the db folder and own it before running anyways.

Should i completely remove the other options / all cli options and only include the compose version? And do you want config settings via file as well or is fine as env vars? since you could set it like this

version: "3"

services:
  ukulele:
    image: ukulele
    environment:
      CONFIG_TOKEN: MY_SECRET_TOKEN
      CONFIG_PREFIX: "!"

[freyacodes]

I think it would be simplest to just use the config file and only recommend docker-compose.