Foreman should not load .env file as it conflicts with Kamal

See cssbundling-rails #155

Author: dhh

lib/install/dev

@@ -8,4 +8,4 @@ fi
 # Default to port 3000 if not specified
 export PORT="${PORT:-3000}"
 
-exec foreman start -f Procfile.dev "$@"
+exec foreman start -f Procfile.dev --env /dev/null "$@"