GitHub ci with nix cachix stack and cabal (#76)

* Nix flake file for dev work & CI builds

* Add CI workflow

* Update the Nix Flake for building with GHC 8.10.x and Cabal Install

* Add a Nix Flake for building with Stack & GHC 8.8

* Add a GitHub CI workflow to build with both legacy stack & cabal

* ignore cabal & nix build directories

.github/workflows/ci.yml

@@ -0,0 +1,28 @@
+name: CI
+
+on:
+  push:
+    branches:
+    - master
+  pull_request:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/[email protected]
+    - uses: cachix/install-nix-action@v16
+      with:
+        extra_nix_config: |
+          access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}
+          substituters = https://hydra.iohk.io https://cache.nixos.org/
+          trusted-public-keys = hydra.iohk.io:f/Ea+s+dFdN+3Y/G+FDgSq+a5NEWhJGzdjvKNGv0/EQ= cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY=
+    - uses: cachix/cachix-action@v10
+      with:
+        name: scarf
+        authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
+        extraPullNames: cachix,iohk,nix-community
+    - run: nix build
+    - run: nix develop --command /usr/bin/env -- bash -c 'hpack && cabal --ghc-options="-Wall -Wcompat -Werror" test'
+    - run: nix build ./.stack-flake
+    - run: nix develop ./.stack-flake --command /usr/bin/env -- bash -c 'hpack && cabal --ghc-options="-Wall -Wcompat -Werror" test'

.gitignore

@@ -1,3 +1,5 @@
 .stack-work/
 curl-runnings.cabal
 *~
+dist-newstyle/
+result