Add CI on AMD GPUs

[pgrete]

PR Summary

PR Checklist

• [x] Code passes cpplint
• [ ] New features are documented.
• [x] Adds a test for any bugs fixed. Adds tests for new features.
• [x] Code is formatted
• [x] Changes are summarized in CHANGELOG.md
• [ ] Change is breaking (API, behavior, ...)
  • [ ] Change is additionally added to CHANGELOG.md in the breaking section
  • [ ] PR is marked as breaking
  • [ ] Short summary API changes at the top of the PR (plus optionally with an automated update/fix script)
• [ ] CI has been triggered on Darwin for performance regression tests.
• [x] Docs build
• [ ] (@lanl.gov employees) Update copyright on changed files

[pgrete]

Alright, this is working and ready for review. The new extended tests on AMD are not triggered yet (will only happens once the pipeline is in develop), but I confirmed directly on the machine that they run and pass. Eventually, I also want to move the Cuda and host tests to the new machine, but given that the old pipelines work it doesn't have a super high priority right now.