Tests about hp3d HOT 5 OPEN

It's likely to come up in review. Peter works on deal.II, which uses the approach of creating a Docker image with all dependencies and using that from Actions. https://github.com/dealii/dealii/blob/master/.github/workflows/linux.yml#L40
An alternative is to install dependencies using a package manager (such as apt install) from the script.

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It would be wonderful to hook these tests up to GitHub actions (or other continuous integration).

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Thanks for the suggestion, @jedbrown. It's on our TODO list but so far no one's worked on it (personally I don't have much experience setting up GitHub actions for packages with lots of dependencies). I've now opened #155 to keep track of any CI efforts specifically.

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I figured that installing dependencies from script we'd probably run out of free minutes on GitHub fairly quickly. But I'll look into the option with the Docker image - thanks for the suggestion.

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Added CI in #159

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