Ci dev

I created the CI worklows for Github.
Since Github does not yet support the concept of hidden keys and anchors, I could not use the templating as in the gitlab-ci.yml but had to copy&paste the code.
Additionally I created a bash script that runs the omc scripts and throws an error if the output contains a "false". This should be the case if the omc execution does not end as expected. Thus, the bash script makes the CI stage fail if some omc errors occur.