Accept etc/environment variable overrides at startup #34
Description
Mirroring the variables from docker-agent https://github.com/Netuitive/docker-agent/blob/master/entrypoint.sh
This would greatly improve deployment automation to grab variables from /etc/environment during startup of the Netuitive Agent, not just installation.
Keep the API_KEY requirement in the installation sh script in case there is a problem with ENV retrieval, so we still get a basic functioning agent.