Add COOKIE workaround for Nix package

nix/package.nix

@@ -9,6 +9,19 @@ beamPackages.mixRelease rec {
   version = "0.1.0";
 
   inherit src;
+  
+  # Disable distributed Erlang to avoid COOKIE requirement
+  postInstall = ''
+    # Create wrapper script that sets proper environment
+    mv $out/bin/systant $out/bin/.systant-wrapped
+    cat > $out/bin/systant << EOF
+#!/bin/sh
+export RELEASE_DISTRIBUTION=none
+export RELEASE_NODE=nonode@nohost
+exec "$out/bin/.systant-wrapped" "\$@"
+EOF
+    chmod +x $out/bin/systant
+  '';
 
   # Mix dependencies will be automatically fetched and cached by Nix
   mixFodDeps = beamPackages.fetchMixDeps {