Add basic flake

flake.lock

@@ -0,0 +1,25 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1601906239,
+        "narHash": "sha256-P1jBYbYeFswig/0FKbgh+BpVhh9iurD3m0T2ae4gdx8=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "c2bb4af48d26ed091e5674394bacbf8d488c7939",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "type": "indirect"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,27 @@
+{
+  description = "Arion - use Docker Compose via Nix";
+
+  outputs = { self, nixpkgs }:
+  let
+    lib = import (nixpkgs + "/lib");
+    systems = [
+      "aarch64-linux"
+      "x86_64-darwin"
+      "x86_64-linux"
+    ];
+  in {
+
+    packages = lib.genAttrs systems (system:
+    let
+      pkgs = nixpkgs.legacyPackages.${system};
+    in
+    {
+      arion = import ./nix/arion.nix { inherit pkgs; };
+    });
+
+    defaultPackage = lib.genAttrs systems (system:
+      self.packages.${system}.arion
+    );
+
+  };
+}