* Rebase on top of detsys-ts for abstracting over install.determinate.systems
* Support the legacy nix-installer-xxx source prefs
* Document source-* opts
* Update deps
* cut duration so it doesn't take forever
* Move the complete step into a finally block
* Test a busted run
* come on ...
* update to the main detsys-ts
* Switch to the delegated execution model
* throw an error to check behavior
* Fixup lint errors
* Drop the forced error
