Add support for WSL, ARM, and 32 bit on GitHub actions

It is worthwhile to test against WSL on Windows in our CI pipeline. We can use this action to set it up: https://github.com/marketplace/actions/setup-wsl.

Start by locating the repository's GitHub Actions workflow configuration and review how the current CI matrix is defined. Check the setup-wsl action referenced in the issue, then determine how WSL, ARM, and 32-bit environments should be represented. Done means CI includes meaningful coverage for the requested environments and the workflows pass.

Written by the indexing model from the issue text.