Release a Docker image

We should release Docker image containing the built binary, just like we do for the Runner itself.

This should be done for the master (as :beta tag) and for tagged versions. The latest "stable" version could be tagged as :latest.

Let's handle this after #6 (closed), so we will have the scripting around detecting the latest stable version.

Edited Aug 30, 2019 by Tomasz Maczukin

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