Add docker runtime configuration for flood process UID and GID

[r0bj]

Type: Feature Request

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Summary

Flood heavily rely on filesystem permissions for accessing files which are shared between other processes (e.g. rtorrent). Currently flood process UID and GID are assigned during image building and are 1001. So in order to allow flood to access files we need to change permissions to less secure model (add access for all users) which is not perfect.

Idea of implementation

Allow to set UID and GID at container runtime via e.g. environment variables.

[r0bj]

Close it with comment: #105 (comment)