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This builds an openjdk base image using the same commands as the upstream, simplified for our use case.
This is a quite simple build, and we don't often need to upgrade openjdk version. Mostly we just upgrade due to issues with the overall base image (ubuntu:20.04). This allow us to respond faster to those issues.
In particular, currently there is an unpatched high vulnerability in openssl for the eclipse-temurin docker image that will cause all our pipelines to fail docker scan. If we use our own openjdk build that will not be an issue because we'll be getting the latest ubuntu 20.04 image that already has this vulnerability patched.
In addition, because this introduces no major changes to how the build process of codacy/base, we can always set
BASE_IMAGE_OPENJDK
in the makefile to some upstream provider, if we ever need to.