Development ltm-1.6 Dockerfile environment variable NAUTOBOT_ROOT syntax

[MeganerdDev]

Environment

• nautobot-golden-config version: ltm1.6 branch

Syntax issue on NAUTOBOT_ROOT for ltm-1.6 Dockerfile here
vs
develop branch here, you can see the intended case

Expected Behavior

Dockerfile sets environment variable
ENV NAUTOBOT_ROOT=${NAUTOBOT_ROOT}

Observed Behavior

Syntax issue, missing = sign for key=value pair
ENV NAUTOBOT_ROOT ${NAUTOBOT_ROOT}

Notes

This will also be seen on ltm-1.6 CI runs, eg: PR #883 CI run here

 1 warning found (use docker --debug to expand):
 - LegacyKeyValueFormat: "ENV key=value" should be used instead of legacy "ENV key value" format (line 22)
Dockerfile:66