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allow custom hostnames setting for db, elastic, rabbit with envvar (#554
) * allow custom hostnames setting for db, elastic, rabbit with envvar You can not always assume the hostname of the remote services. For example, in tezos-k8s, I am running everything in a pod, so I need to set everything to `localhost`. In order to not disrupt any existing workflow, we set these env vars to standard values in the Dockerfile; they can be overridden at runtime. See: https://stackoverflow.com/a/40334819/207209 * use default env in docker-compose instead of Dockerfile * postgres => db
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