Remove hlint from nix CI

Author: newhoggy

.github/workflows/check-hlint.yml

@@ -0,0 +1,31 @@
+name: Check HLint
+
+on:
+  push:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    defaults:
+      run:
+        shell: bash
+
+    steps:
+
+    - name: Install Nix
+      uses: cachix/install-nix-action@v18
+      with:
+        github_access_token: ${{ secrets.GITHUB_TOKEN }}
+        extra_nix_config: |
+          access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}
+          experimental-features = nix-command flakes
+          allow-import-from-derivation = true
+          substituters = https://cache.nixos.org https://hydra.iohk.io
+          trusted-public-keys = iohk.cachix.org-1:DpRUyj7h7V830dp/i6Nti+NEO2/nhblbov/8MW7Rqoo= hydra.iohk.io:f/Ea+s+dFdN+3Y/G+FDgSq+a5NEWhJGzdjvKNGv0/EQ= cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY=
+
+    - uses: actions/checkout@v2
+
+    - name: Run hlint
+      run: |
+        nix build '.#checks/hlint'

flake.nix

@@ -197,10 +197,7 @@
             ))
             # checks run on default system only;
             // (optionalAttrs (system == defaultSystem) {
-            hlint = pkgs.callPackage pkgs.hlintCheck {
-              inherit (project.args) src;
-            };
-          });
+            });
 
           exes = (collectExes project) // {
             inherit (pkgs) cabalProjectRegenerate checkCabalProject;