Instructions on env vars setup needed.

[wtgee]

The docker branch (soon to be merged into develop via #951) assumes there is an environment file in $PANDIR/.env (can be read via dotenv). This environment file currently consists of the following:

PANDIR=/var/panoptes
POCS=/var/panoptes/POCS
PANLOG=/var/panoptes/logs

Additionally, for those running the docker services there should be a:

LOCAL_USER_ID=1000

(This may disappear in future but is necessary now. Also technically it should be the output from id -u not just 1000).

If accessing GCP services then there should also be a:

GOOGLE_APPLICATION_CREDENTIALS=/path/to/service-account-key.json

The .env file helps start up the config server and everything else should be queried via the config server and not rely on env vars.

This means that there must be a one-time manual configuration of the .env file (i.e. it can't be completely self-discoverable).

I'm not sure there is much utility in keeping this broad issue open. As part of my issue cleanup I'm closing this. Can be reopened if needed.

Originally posted by @wtgee in #555 (comment)