POST /api/v1/user/{username} returns bad request if client cert exists, otherwise creates and returns it.
password is a required POST parameter
needs to be atomic
Split into separate issue from #5 because during implementation I found out that this cannot be done without some redesigns on the takserver container side.
Extension to #4 see other requirements from there
Split into separate issue from #5 because during implementation I found out that this cannot be done without some redesigns on the takserver container side.