Fix the deprecated aspects of the project (now use Ubuntu 20.04 and Intellij 2022.3.1) #2
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Update/modernise the Dockerfile to fix the long broken build (old: ubuntu 14 | now uses Ubuntu 20.04, Intellij 2022.3.1, newest Erlang & Elixir etc)
This will run on both x86 and ARM.
I will perhaps update the Dockerfile to use Ubuntu 22 later.