Feature tests as GitHub actions

[felixsch]

Description

Bring feature tests into Github and run them as Github actions, rather then relying on our internal CI pipelines with its complicated setup.

This change will:

• Run feature tests in github actions
• Auto build the ci-container on master push
• Add scriptlets to easily build rpms and run feature tests

Run the pipeline locally

• requires you to run a mariadb on your host machine
• Checkout of the branch into

$ cd <RMT>/ci/
$ docker build --no-cache -t rmt-devel -f Dockerfile .
$ docker run --rm -it -e SCC_USERNAME="<username>" -e SCC_PASSWORD="<password>" --network=host -v $(pwd):/usr/src/rmt-server rmt-devel

> ./ci/rmt-build-rpm 
# expect: in /usr/src/rmt-server/tmp/artifacts/ are built rpms

> ./ci/rmt-configure
# expect: installs and configures rmt from the rpm

> ./ci/rmt-run-feature-tests
# expect: runs the feature tests

[felixsch]

I had a discussion about the prelude for the scripts. I decided against it because I favor self-contained scripts over configuration repition. @josegomezr offered to make a follow up PR if he deems it necessary to make the prelude happen.

I added the shell linting and fixed bash scripts in ci/*