Fix overriding yaml config with envars

Chris Pastl requested to merge yaml-config-120 into main

As described in #53 (closed), envars within the yaml config file are not being parsed and replaced by their values; so we're using confuse's built-in function set_env() for that.

NB: Needed to slightly adapt (docker) envar naming in order to conform to confuse conventions.

Edited by Chris Pastl

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