This is an alternative to screepers/screeps-launcher.
I believe that build and setup should happen during the build of a docker image. The screepers/screeps-launcher does all setup and installation during the run of the image.
This image does all installation and setup during the build stage.
So to launch the server, it will only start the server.
Mods and bots are managed at startup by checking your config.yml.
npm is only invoked if changes are made to your config.yml.
Please check the wiki! I will try to keep that one up to date.