[Feature] Allow use as non-root

[OddMagnet]

General

• My feature does not exist in the latest version of MySpeed.
• I have checked that my feature has not been suggested by anyone else.

Your Idea

I generally like running my docker containers as non-root by providing by using the user attribute in my compose files:

user: ${PUID}:${PGID}

Even though I've create the necessary folders for myspeed, it still crashes with the error that it can't create the already existing data folder.

Would be cool if it could run as non-root