Suggest: add continuous integration

[richelbilderbeek]

Dear hydra maintainers,

I heard from a colleague that this is something awesome! I took a look and was happy with the license and tests. What I feel would impress me even more, is to add continuous integration, i.e. that (some of) the tests are run on GitHub Actions. This would convince any use that -after each commit- that the code still works. Sure, if asked, I do volunteer to add this.

Cheers, Richel Bilderbeek, postdoc

[richelbilderbeek]

To add to this: a colleague could not get hydra installed. With CI one can prove that CI can be installed on at least one system. It helps users to rule out that hydra is at fault here. As a software maintainer: this saves you quite some 'It does not work!' emails from users :-)