add nix flake

.gitignore

@@ -1 +1,2 @@
 parent
+result

flake.lock

@@ -0,0 +1,27 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1661450036,
+        "narHash": "sha256-0/9UyJLtfWqF4uvOrjFIzk8ue1YYUHa6JIhV0mALkH0=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "f3d0897be466aa09a37f6bf59e62c360c3f9a6cc",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,18 @@
+{
+  description = "Minimal process wrapper";
+
+  inputs.nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
+
+  outputs = { self, nixpkgs }: let
+    pkgs = import nixpkgs { system = "x86_64-linux"; };
+  in {
+    packages.x86_64-linux.parent = pkgs.buildGoModule {
+      pname = "parent";
+      version = "1.0";
+      src = ./.;
+      vendorSha256 = null;
+    };
+
+    defaultPackage.x86_64-linux = self.packages.x86_64-linux.parent;
+  };
+}