Publish docker images on Docker Hub

[aminya]

setup-cpp has had docker images for different platforms:
https://github.com/aminya/setup-cpp/tree/master/dev/docker

It would be a great idea to publish these images on Docker Hub. This could make it easier to test the code on different platforms when everything is already set up. It could also reduce the build times as the docker images can be downloaded and cached faster.

We can probably use a tagging scheme that is consistent with the base image, and also indicate the main compiler that is used in .cpprc.

For example, we can have these images:

• setup-cpp-ubuntu-llvm:22.04-15
• setup-cpp-fedora-llvm:30-15
• setup-cpp-ubuntu-gcc:22.04-13
• ...

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[aminya]

Fixed in #237