Remove service accounts and switch backend to stateful set

We don't need service accoutns as OBS doesn't talk to the kubernetes API. Also a stateful set fits better to the backend as there is obviously clearly a state.

approved this merge request

added 4 commits

• 86d2d397...cbfda8eb - 2 commits from branch collabora/staging
• ea8aaf85 - Remove service account creation
• ef9b6973 - Switch to stateful set

Compare with previous version

enabled an automatic merge when the pipeline for ef9b6973 succeeds

merged