Use cloud for auto-update (#42246)

We've had several outages with a proximate cause of "vercel is
complicated",
and auto-update is considered a critical feature; so lets not use vercel
for
that.

Release Notes:

- Auto Updates (and remote server binaries) are now downloaded via
https://cloud.zed.dev instead of https://zed.dev. As before, these URLs
redirect to the GitHub release for actual downloads.

script/bundle-mac

@@ -22,7 +22,7 @@ Build the application bundle for macOS.
 Options:
   -d    Compile in debug mode
   -o    Open dir with the resulting DMG or launch the app itself in local mode.
-  -i    Install the resulting DMG into /Applications in local mode. Noop without -l.
+  -i    Install the resulting DMG into /Applications.
   -h    Display this help and exit.
   "
 }
@@ -209,16 +209,6 @@ function sign_app_binaries() {
         codesign --force --deep --entitlements "${app_path}/Contents/Resources/zed.entitlements" --sign ${MACOS_SIGNING_KEY:- -} "${app_path}" -v
     fi
 
-    if [[ "$target_dir" = "debug" ]]; then
-        if [ "$open_result" = true ]; then
-            open "$app_path"
-        else
-            echo "Created application bundle:"
-            echo "$app_path"
-        fi
-        exit 0
-    fi
-
     bundle_name=$(basename "$app_path")
 
     if [ "$local_install" = true ]; then
@@ -229,6 +219,16 @@ function sign_app_binaries() {
             echo "Opening /Applications/$bundle_name"
             open "/Applications/$bundle_name"
         fi
+    elif [ "$open_result" = true ]; then
+        open "$app_path"
+    fi
+
+    if [[ "$target_dir" = "debug" ]]; then
+        echo "Debug build detected - skipping DMG creation and signing"
+        if [ "$local_install" = false ]; then
+            echo "Created application bundle:"
+            echo "$app_path"
+        fi
     else
         dmg_target_directory="target/${target_triple}/${target_dir}"
         dmg_source_directory="${dmg_target_directory}/dmg"