I forgot to mention this last time: Toit now has a fork of Qemu that we can use for testing. (It's mostly based on micropython's one with a few patches). We have prebuilt executables on our release page (github.com/toitlang/qemu), but you can also get it for GitHub actions with `qemu-version`:

- uses: toitlang/action-setup@v1
  with:
    toit-version: v2.0.0-alpha.197
    qemu-version: v9.2.2-toitlang.2

Most likely you will want tojust use

latest

as the qemu-version. The Toit specific README in the qemu repo: https://github.com/toitlang/qemu/blob/main/README.toit.md