Update Dockerfile to be in line with other WKT projects #269
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This Dockerfile now looks similar to the one for WKO and does not pull images from Docker Hub.
The only change in behavior is that the previous Dockerfile ran the Maven build in a stage while the updated Dockerfile expects that a Maven build has already been completed prior to creating the container image.
I've looked at a) the release automation here in this project, and b) the WKO integration tests that create a monitoring exporter image from scratch and both places already do the Maven build first.