CI: current status

Known limitations / issues:

• bootstrap should return error code on failure: https://gitlab.com/ArmarX/meta/setup/-/jobs/2822880861

What should be added:

• ccache support. see draft in https://gitlab.com/ArmarX/meta/setup/-/merge_requests/71/diffs#587d266bb27a4dc3022bbed44dfa19849df3044c