nix.stable.tests.nix-fallback-paths: Allow cross-compiled store path name

Nix 2.24 has a riscv5-linux path that's cross-compiled
e.g. nix-riscv64-unknown-linux-gnu-2.24.2

pkgs/tools/package-management/nix/default.nix

@@ -115,7 +115,9 @@ let
         runCommand "test-nix-fallback-paths-version-equals-nix-stable" {
           paths = lib.concatStringsSep "\n" (builtins.attrValues (import ../../../../nixos/modules/installer/tools/nix-fallback-paths.nix));
         } ''
-          if [[ "" != $(grep -v 'nix-${pkg.version}$' <<< "$paths") ]]; then
+          # NOTE: name may contain cross compilation details between the pname
+          #       and version this is permitted thanks to ([^-]*-)*
+          if [[ "" != $(grep -vE 'nix-([^-]*-)*${lib.strings.replaceStrings ["."] ["\\."] pkg.version}$' <<< "$paths") ]]; then
             echo "nix-fallback-paths not up to date with nixVersions.stable (nix-${pkg.version})"
             echo "The following paths are not up to date:"
             grep -v 'nix-${pkg.version}$' <<< "$paths"