* add Dockerfile
* add docker-compose.yml
* Github workflow to build and deploy docker image
* workdir /data/ instead of /app/
* use a local directory instead of a named volume
This makes the settings.json more accessible from the outside by
default, but is less portable.
The -v command with $PWD might not work on native Windows shells, but
rather wants an absolute Windows path like C:\User\... or /c/User/...
And on Linux, because the /data/ directory and the settings.json will be
owned by root. Though that can be changed.
* more docker-compose command examples
* add linux/arm/v7 ; improve build & runtime
* fix: just arm not arm32
* test docker build for PRs
* back to the microsoft runtime
