Community maintained Docker config for the knot server

Add `UID` and `GID` arguments to Dockerfile #45

Merged tangled.org
targeting main
Merged opened by and assigned to tangled.org
targeting main

UID and GID args can now be set during build, so following the example command in the README should fix #2 by providing a UID and GID that exist on the host so that the directories owned by git in the container can be bind mounted on the host.

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