fish: append path

nix/configurations/vanadium/home/programs.nix

@@ -48,7 +48,8 @@ in {
             if test -d ~/.environments
               for file in ~/.environments/*
                 if not string match -q --regex -- '-link$' $file
-                  fish_add_path $file/bin || true
+                  # Append so if invoked from a nix shell, doesn't mess with the shell's specific paths
+                  fish_add_path --append $file/bin
                 end
               end
             end