Add Nix package to new Zig compiler

.github/workflows/ci_zig.yml

@@ -227,6 +227,16 @@ jobs:
           git clean -fdx
           git reset --hard HEAD
           nix develop ./src/ -c zig build && zig build snapshot && zig build test
+
+      - name: Test Nix package                                                                                          
+        if: ${{ runner.os == 'Linux' || (runner.os == 'macOS' && runner.arch != 'X64') }}        
+        uses: ./.github/actions/flaky-retry                       
+        with:
+          command: |                                                                                                          
+            nix build ./src#roc                                                                                          
+            result/bin/roc check src/PROFILING/bench_repeated_check.roc          
+          error_string_contains: TemporaryNameServerFailure
+          retry_count: 3     
 
   zig-cross-compile:
     needs: check-once

src/flake.nix

@@ -9,9 +9,14 @@
 
     # to easily make configs for multiple architectures
     flake-utils.url = "github:numtide/flake-utils";
+
+    gitignore = {
+    url = "github:hercules-ci/gitignore.nix";
+    inputs.nixpkgs.follows = "nixpkgs";
+  };
   };
 
-  outputs = { self, nixpkgs, flake-utils, ... }@inputs:
+  outputs = { self, nixpkgs, flake-utils, gitignore,... }@inputs:
     let
       supportedSystems =
         [ "x86_64-linux" "x86_64-darwin" "aarch64-darwin" "aarch64-linux" ];
@@ -48,6 +53,29 @@
         '';
 
       in {
+        packages = {
+          default = self.packages.${system}.roc;
+          roc = pkgs.stdenv.mkDerivation {
+            name = "roc";
+            src = gitignore.lib.gitignoreSource  ../.;
+            nativeBuildInputs = [ pkgs.zig.hook ];
+            zigBuildFlags = [ "-Dfuzz" "-Dsystem-afl=false" "-Doptimize=ReleaseFast" ];
+            zigCheckFlags = [  ];
+            zigInstallFlags = [ ];
+          };
+        };
+
+        apps = {
+          default = self.apps.${system}.roc;
+          roc = {
+            type = "app";
+            program = "${self.packages.${system}.roc}/bin/roc";
+            meta = {
+              description = "Roc CLI";
+              mainProgram = "roc";
+            };
+          };
+        };
 
         devShell = pkgs.mkShell {
           buildInputs = dependencies;