Document healthcheck in Dockerfile

[koebi]

Page Link

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Documentation is ...

Missing/Needed

Please Explain in Detail:

We recently implemented a healthcheck that informs the user of the state of the openrouteservice.
This leads to (unhealthy) or (healthy) output in docker ps.
The meaning of these are unclear.

Your Proposal for Changes:

The what you get-section on https://giscience.github.io/openrouteservice/run-instance/running-with-docker#what-you-get should have a short intro to docker ps and mention the healthcheck.

Forum Topic Link

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