Var names not allowed

[arthurd2]

Hey people, While building the docker on Ubuntu, the system warns me that variables with . in their names are not allowed. Maybe ElasticSearch have changed these names: https://github.com/artefactual/atom/blob/9fd22ace13c16132d1b73f639c08f445ade02bd7/docker/etc/environment#L2 https://github.com/artefactual/atom/blob/9fd22ace13c16132d1b73f639c08f445ade02bd7/docker/etc/environment#L3 https://github.com/artefactual/atom/blob/9fd22ace13c16132d1b73f639c08f445ade02bd7/docker/etc/environment#L4