fix nats-box deployment so nats user can be used

[ddanat-smm]

When installing nats-box with the helm chart the current implementation saves the current directory as the "work_dir". In the Dockerfile that is "/root". Even though the user "nats" with uid 1000 is created in the Dockerfile, if the current deployment (which just does a sleep infinity) starts as uid 1000, work_dir gets saved as "/root" and when the cd $work_dir comes, the container crashes. This fixes that issue.

Sorry if this doesn't quite adhere to your PR guidelines - this is just a quick and dirty commit

[caleblloyd]

I think a better fix may be changing the exec to:

exec /entrypoint.sh "$@"

Because the nats-box entrypoint already handles this logic

That will also not break anyone who is using workingDir

[caleblloyd]

Opened #883 with the change, closing this one