* also add the ability to download the tar for supported releases
* use env variables for distribution, channel and branch
* add tests for new archive download for supported releases
* fix version syntax
* commander: verify output of version.sh
* commander: exit setup.sh with code 1 when .env exists
* add commander to travis
* minimal test for commander in core container
* tune .editorconfig for the existing files
* fix reported linting issues
* travis: switch language to node_js to be able to run npm
* travis: build on ubuntu bionic
* add docker pull to warm up build cache on travis
* explicitly build multi stage build stages
* make create repo script dynamic in the choice of the distribution
add example docker-compose (for easy copy and paste)
refactor common multi stage image to base image for core and webapp
add docker version tagging
add a version to the base image as well
Signed-off-by: Felix Bartels <felix@host-consultants.de>