give it a try another

Author: ingun37

.github/workflows/main.yml

@@ -6,15 +6,14 @@ jobs:
     steps:
     - uses: actions/checkout@v4
     - uses: cachix/install-nix-action@v31
-      # with:
-      #   extra_nix_config: |
-      #     trusted-public-keys = hydra.iohk.io:f/Ea+s+dFdN+3Y/G+FDgSq+a5NEWhJGzdjvKNGv0/EQ= cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY=
-      #     substituters = https://cache.iog.io/ https://cache.nixos.org/
+      with:
+        extra_nix_config: |
+          trusted-public-keys = hydra.iohk.io:f/Ea+s+dFdN+3Y/G+FDgSq+a5NEWhJGzdjvKNGv0/EQ= cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY=
+          substituters = https://cache.iog.io/ https://cache.nixos.org/
+        nix_path: nixpkgs=channel:nixos-unstable
     - uses: cachix/cachix-action@v15
       with:
         name: inguncache
         authToken: "${{ secrets.CACHIX_AUTH_TOKEN }}"
     - run: |
-        nix-shell -p cabal2nix --run "cabal2nix . > default.nix"
-        cat default.nix
         nix-build

flake.nix

@@ -0,0 +1,41 @@
+{
+  description = "A very basic flake";
+  inputs.haskellNix.url = "github:input-output-hk/haskell.nix";
+  inputs.nixpkgs.follows = "haskellNix/nixpkgs-unstable";
+  inputs.flake-utils.url = "github:numtide/flake-utils";
+  outputs = { self, nixpkgs, flake-utils, haskellNix }:
+    flake-utils.lib.eachSystem [ "x86_64-linux" "x86_64-darwin" ] (system:
+    let
+      overlays = [ haskellNix.overlay
+        (final: _prev: {
+          # This overlay adds our project to pkgs
+          helloProject =
+            final.haskell-nix.project' {
+              src = ./.;
+              compiler-nix-name = "ghc9121";
+              # This is used by `nix develop .` to open a shell for use with
+              # `cabal`, `hlint` and `haskell-language-server`
+              shell.tools = {
+                cabal = {};
+                # hlint = {};
+                # haskell-language-server = {};
+              };
+              # Non-Haskell shell tools go here
+              shell.buildInputs = with pkgs; [
+                nixpkgs-fmt
+              ];
+              # This adds `js-unknown-ghcjs-cabal` to the shell.
+              # shell.crossPlatforms = p: [p.ghcjs];
+            };
+        })
+      ];
+      pkgs = import nixpkgs { inherit system overlays; inherit (haskellNix) config; };
+      flake = pkgs.helloProject.flake {
+        # This adds support for `nix build .#js-unknown-ghcjs:hello:exe:hello`
+        # crossPlatforms = p: [p.ghcjs];
+      };
+    in flake // {
+      # Built by `nix build .`
+      packages.default = flake.packages."answers-script:exe:answers-script";
+    });
+}