Many of our Travis CI tests run on special hardware (like power pc) and cannot be migrated to GitHub actions (except possibly via QEMU, which isn't exactly equivalent). However, we have some Travis CI tests which run on AMD64 architecture. It's likely that at least some can be migrated to GitHub Actions, which moves us closer to our goal of eliminating dependency on Travis CI.

Follow-up to this issue: it's likely possible to migrate many Circle CI tests as well.