Fix nix wrapper not handling exit codes properly

Signed-off-by: magic_rb <magic_rb@redalder.org>

flake.nix

@@ -262,7 +262,6 @@
                 immutable=0
 
                 for arg in "$@" ; do
-                  echo "$arg"
                   if [[ "$arg" =~ ^git\+file://.*$ ]] ; then
                     immutable=1
                   fi
@@ -308,6 +307,7 @@
                 done
 
                 ( exec -a $0 .nix-unwrapped "''${new_args[@]}" )
+                ret_code=$?
 
                 post_lock_hash="$(sha256sum flake-secret.lock | cut -f1 -d' ')"
 
@@ -315,6 +315,7 @@
                   cp flake-secret.lock flake.lock
                   .nix-unwrapped flake lock --override-input secret path:///var/empty
                 fi
+                exit $ret_code
               '';
               nix-with-wrapper = pkgs.symlinkJoin {
                 name = "nix";