[Refactor] Rootless docker image

[valentimarco]

At the moment, we run the docker image as Root... No good!

[pieroit]

Fixed in #790 , to be merged in V2 as creates breaking changes.
Please leave open both issue and PR

Thanks @dave90 @valentimarco @AlessandroSpallina for fixing and testing

[MihirKohli]

is this issue still open?

[pieroit]

is this issue still open?

Tagged V2 means we want to qork on this in the next major

There is a dedicated branch for v2, beware it is a messssss