Reverse CI workflow for testing Uno + HiGHS

[cvanaret]

Hi @galabovaa @jajhall,
Would you be open to adding a reverse CI workflow to your repo so that we can test Uno + HiGHS and make sure that things do not break between releases?

Charlie

cc @amontoison

[galabovaa]

Yes, please! It would be a great addition to our CI 🚀