fix flake

flake.nix

@@ -1,25 +1,55 @@
 {
-  description = "test";
+  description = "Customer Service - Phoenix/Commanded CQRS/ES service";
 
   inputs = {
-    nixpkgs.url = "github:nixos/nixpkgs";
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
     flake-utils.url = "github:numtide/flake-utils";
   };
 
-  outputs = { self, nixpkgs, flake-utils, ... }:
-    flake-utils.lib.eachDefaultSystem (system:
+  outputs = {
+    self,
+    nixpkgs,
+    flake-utils,
+  }:
+    flake-utils.lib.eachDefaultSystem (
+      system:
       let
         pkgs = nixpkgs.legacyPackages.${system};
-
-      in {
-        devShell =
-        pkgs.mkShell {
-          buildInputs = with pkgs;
-             [
-               elixir
-               elixir-ls
-               git
-            ];
+        beamPackages = pkgs.beamPackages;
+        pname = "customer_service";
+        version = "1.0.0";
+        mixFodDeps = beamPackages.fetchMixDeps {
+          inherit pname version;
+          src = pkgs.lib.cleanSource ./.;
+          sha256 = "sha256-SspB/uMURF/QIjs+h11rr+X/pJ4dy7zuX8HV52CK998=";
         };
-      });
+        package = beamPackages.mixRelease {
+          inherit pname version mixFodDeps;
+          src = pkgs.lib.cleanSource ./.;
+          meta = {
+            mainProgram = "customer_service";
+          };
+          removeCookie = false;
+        };
+        dockerImage = pkgs.dockerTools.buildLayeredImage {
+          name = "customer_service";
+          contents = [ package pkgs.bashInteractive pkgs.busybox pkgs.shadow ];
+          config = {
+            Cmd = [ "${package}/bin/customer_service" "start" ];
+          };
+        };
+      in
+      {
+        packages.default = package;
+        packages.dockerImage = dockerImage;
+        devShells.default = pkgs.mkShell {
+          buildInputs = with pkgs; [
+            elixir
+            elixir-ls
+            kubernetes-helm
+            git
+          ];
+        };
+      }
+    );
 }