Logs get logged to both /var/log/lnt/lnt.log and /var/lib/lnt/instance/lnt.log

[ldionne]

Due to https://github.com/llvm/llvm-lnt/blob/main/docker/docker-entrypoint.sh#L27, we log to /var/log/lnt/lnt.log. That's where we intend to log stuff.

However, due to https://github.com/llvm/llvm-lnt/blob/main/lnt/server/ui/app.py#L36 and https://github.com/llvm/llvm-lnt/blob/main/lnt/server/ui/app.py#L193, we end up also logging at <instance-path>/lnt.log, which is within /var/lib/lnt. That's bad since in production, /var/lib/lnt is intended to persist since it contains the instance configuration.