docker container runs thor under new user

[kgapos]

docker runs the node though a new thor user, following the slowmist security guidelines, instead of the current implementation, which runs it under root

[kgapos]

This is a minor improvement, I suppose the blast radius is already limited by docker. I was more interested in trying out the contribution process. I welcome any and all feedback, feel free to merge this (or not)

[libotony]

Thanks！ Looks good to me, I'll test locally

[libotony]

Wasted some on my local container runtime colima which has some problems of mounted volume, Docker Desktop for mac and docker engine on linux works fine.