No errors if supervisor do not exists...

[NikitaKharkov]

I think you should add some check of supervisor. I spent about 30 minutes to find that in past I installed it in docker image by hands. And now, then I returned to this task, I try to build, to start, to init and commands doesn't help me. Only after some time I called to mind that I haven't installed supervisor yet

[Phobetor]

Sorry for the inconvenience @NikitaKharkov . You are absolutely right. I will add error output for that case.

[NikitaKharkov]

Thank you very much!

[kisztof]

#22 Here you are :)

[Phobetor]

Should be handled by #22 which is merged to master and released as new version 3.0.0.
@NikitaKharkov please tell me if that works for your case.