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Adds healthcheck instructions to the dockerfiles.

Markus Hubig requested to merge mhubig/gitlab-runner:adds-healthchecks-to-the-dockerfiles into master

What does this MR do?

It adds a HEALTHCHECK instruction to the dockerfiles. The HEALTHCHECK instruction checks the return status of the embedded HTTP Statistics Server for Prometheus metrics. This exposes a health status for the docker container with can be checked via docker inspect --format='{{json .State.Health}}'.

Why was this MR needed?

It would be very convenient to have the health status available when automating the deployment of gitlab-runner container.

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