Make sure unknown storefront types still appear in the list

packages/create-catalyst/src/commands/create.ts

@@ -115,8 +115,22 @@ async function handleChannelSelection(bc: Https) {
     message: 'Which channel would you like to use?',
     choices: availableChannels.data
       .sort(
-        (a: Channel, b: Channel) =>
-          channelSortOrder.indexOf(a.platform) - channelSortOrder.indexOf(b.platform),
+        (a: Channel, b: Channel) => {
+          const aIndex = channelSortOrder.indexOf(a.platform);
+          const bIndex = channelSortOrder.indexOf(b.platform);
+
+          // If both platforms are not in the sort order, maintain their original order
+          if (aIndex === -1 && bIndex === -1) {
+            return 0;
+          }
+
+          // If one platform is not in the sort order, it should go to the end
+          if (aIndex === -1) return 1;
+          if (bIndex === -1) return -1;
+
+          // If both platforms are in the sort order, use their relative positions
+          return aIndex - bIndex;
+        },
       )
       .map((ch: Channel) => ({
         name: ch.name,