Better CI caching #203
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Better CI caching #203
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This should work as of GHC 9.4. This is largely based upon: https://harry.garrood.me/blog/easy-incremental-haskell-ci-builds-with-ghc-9.4/ I've omitted the GHC version for simplicity.
For CI testing.
Newer versions of Cabal no longer use ~/.cabal/ unless it's already present (XDG).
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This PR fixes the Cabal store cache, adds cache restore keys, splits TypeScript dependencies into their own Nix shell, and adds caching of incremental build artifacts.
Building is reduced from ~5 mins to ~1 min 30s. A CI run with changed code and dependencies should be expected to run somewhere between these two numbers, utilising partial caches. The TypeScript typechecking job is also reduced from ~60s to ~20s