build

Add flake.nix and test on CI #67

Job	Run time
Generate GHC versions for nix flake build matrix	27s
Haskell GHC 8.4.4 cabal	2m 38s
Haskell GHC 8.6.5 cabal	2m 26s
Haskell GHC 8.8.4 cabal	2m 31s
Haskell GHC 8.10.7 cabal	2m 38s
Haskell GHC 9.0.2 cabal	2m 38s
Haskell GHC 9.2.2 cabal	2m 30s
Haskell GHC 9.4.2 cabal	2m 37s
Haskell GHC 9.6.6 cabal	2m 21s
Haskell GHC 9.8.1 cabal	2m 37s
Haskell GHC 9.10.1 cabal	1m 59s
Haskell GHC 9.12.1 cabal	1m 44s
Nix Flake (ghc84, ubuntu-latest)	25s
Nix Flake (ghc84, macos-latest)	58s
Nix Flake (ghc86, ubuntu-latest)	20s
Nix Flake (ghc86, macos-latest)	58s
Nix Flake (ghc88, ubuntu-latest)	20s
Nix Flake (ghc88, macos-latest)	54s
Nix Flake (ghc90, ubuntu-latest)	22s
Nix Flake (ghc90, macos-latest)	53s
Nix Flake (ghc92, ubuntu-latest)	20s
Nix Flake (ghc92, macos-latest)	1m 1s
Nix Flake (ghc94, ubuntu-latest)	24s
Nix Flake (ghc94, macos-latest)	55s
Nix Flake (ghc96, ubuntu-latest)	25s
Nix Flake (ghc96, macos-latest)	55s
Nix Flake (ghc98, ubuntu-latest)	21s
Nix Flake (ghc98, macos-latest)	1m 11s
Nix Flake (ghc910, ubuntu-latest)	25s
Nix Flake (ghc910, macos-latest)	52s
Nix Flake (ghc912, ubuntu-latest)	26s
Nix Flake (ghc912, macos-latest)	56s
	40m 27s

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