Produce build artifacts in CI
For the time being at least, at the time of releases, these will have to be manually attached to annotated tags per Sourcehut's documentation.
Signify presence of scripts with exit code
This also removes the output text when no scripts are found.
Add build status to README
Add CI tests
Running CI in Arch didn't work with ghcup, and with NixOS currently
using the same versions of everything (GHC 8.10.4, Cabal 18.104.22.168) it's
the easiest solution.
Minor refactor Solver fns
Represent scripts as a non-empty set
This prevents us from needing to think about duplicate scripts.
Remove ToolResult type; embrace Map
Use _ prefix notation for lenses
Update -v text for consistency with -h
Add supported tooling to README
Append scripts via lens
This is a lot of complexity to introduce to benefit a single call site, but I want to learn more about lenses. :)
Improve Yarn strategy, removing dependency upon npm
Implement more robust solver
Fix npm not displaying if there are no scripts