Add release.nix

Author: Shay Bergmann

release.nix

@@ -0,0 +1,12 @@
+{ src ? builtins.fetchGit ./.
+, supportedSystems ? [ builtins.currentSystem ]
+}:
+let
+  sources = import nix/sources.nix;
+  lib = import (sources.nixpkgs + "/lib");
+in
+{
+  mantis = lib.genAttrs supportedSystems (system: {
+    inherit src system;
+  });
+}