What:
- On Linux, MacOS, and Windows, installs sbcl-bin and all the _working_
versions of Roswell, ASDF, and Qlot
- Runs `qlot exec ros` to install a project (to see if it errors out or
not)
When:
- Each pushed change
- Each pull request action (not our own!)
- Every Saturday night
(Note: when running on the Saturday night, the workflow will try and
install the _latest_ version of Roswell, ASDF, and Qlot)
