Deal with env vars in Dockerfiles/docker-compose.yml files.

[jhujasonw]

Dockerfiles and docker-compose.yml files can contain variables. Need to figure out a way to deal with and/or resolve those values.

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[jhujasonw]

This could potentially be done with the 'envsubst` command, but it's not clear to me if that opens up any security issues. More investigation/conversation is probably needed.

[derekbelrose]

Yes, some docker images won't run unless you supply a test set of variables which could wouldn't be too bad to implement