Users other than root cannot write to /valohai/inputs

[noorula]

If the Docker container is started with other user than root it is not possible to write to /valohai/inputs as other does not have writing permissions there. This is a problem when using archives as inputs as valohai-utils tries to unarchive them into /valohai/inputs by default.

Suggested solutions:

• Allow other to write in /valohai/inputs or even /valohai/*
  OR
• If the user is other than root do the unarchiving somewhere else where the user has write permission.

[tokkoro]

I think now that we have made changes how inputs are mounted we should try this again after we have that released. This issue might be fixed by that already.

[noorula]

This was brought up by a customer again so if someone has some interested in taking a look at this that would be nice.