build: filter by arch to prevent duplicated

Author: SergioRibera

flake.nix

@@ -113,7 +113,9 @@
         }) architectures)) // (pkgs.lib.listToAttrs (map ({arch, ...} @ args: {
           name = "image-${arch}";
           value = containerPkg args;
-        }) architectures));
+        }) (pkgs.lib.flip builtins.mapAttrs (
+          lib.groupBy (x: x.arch) architectures
+        ) (group: builtins.head group))));
 
         apps = {
           help = {