Provide runtime configuration override via environment variables

[tomkerkhove]

In #431 we've introduced our runtime YAML configuration, however, in certain scenarios, it's good to be able to override them via environment variables as suggested by @jdevalk2 in his comment.

I like the suggestion of using a similar approach to Grafana :

[server]
name=bla

Can be overridden with environment variable GF_SERVER_NAME=bla2

[github-actions]

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[tomkerkhove]

@jdevalk2 Since our configuration is now a YAML file, but able to be overriden via ENV variables, can we close this one?

https://promitor.io/configuration/v1.x/runtime#overriding-configuration-with-environment-variables

[jdevalk2]

@tomkerkhove Its exactly what this ticket talks about so this one can be closed. LGTM.