fix(ci): detect AltTester Desktop in /Applications, ~/Applications, and via mdfind

Author: rodrigo-fournier-immutable

.github/workflows/ui-tests.yml

@@ -149,10 +149,29 @@ jobs:
         run: pip install -r sample-unity6/Tests/requirements-desktop.txt
       - name: Start AltTester Desktop (AltServer) headless on port 13000
         run: |
-          ALT_APP="${ALTTESTER_DESKTOP_APP:-/Applications/AltTester Desktop.app}"
-          if [ ! -d "$ALT_APP" ]; then
-            echo "AltTester Desktop not found at $ALT_APP; install it so the app and driver can connect to port 13000."
-            echo "See sample-unity6/Tests/README-ALTTESTER-MACOS.md"
+          # Use env var if set; otherwise search common locations
+          if [ -n "$ALTTESTER_DESKTOP_APP" ] && [ -d "$ALTTESTER_DESKTOP_APP" ]; then
+            ALT_APP="$ALTTESTER_DESKTOP_APP"
+            echo "Using ALTTESTER_DESKTOP_APP: $ALT_APP"
+          else
+            ALT_APP=""
+            for candidate in "/Applications/AltTester Desktop.app" "$HOME/Applications/AltTester Desktop.app"; do
+              if [ -d "$candidate" ]; then
+                ALT_APP="$candidate"
+                echo "Found AltTester Desktop at: $ALT_APP"
+                break
+              fi
+            done
+            if [ -z "$ALT_APP" ]; then
+              echo "Searching system for AltTester Desktop (mdfind)..."
+              ALT_APP=$(mdfind "kMDItemCFBundleIdentifier == 'com.alttester.desktop'" 2>/dev/null | grep -E '\.app$' | head -1)
+              [ -z "$ALT_APP" ] && ALT_APP=$(mdfind "AltTester Desktop.app" 2>/dev/null | grep -E 'AltTester Desktop\.app$' | head -1)
+              [ -n "$ALT_APP" ] && echo "Found via mdfind: $ALT_APP"
+            fi
+          fi
+          if [ -z "$ALT_APP" ] || [ ! -d "$ALT_APP" ]; then
+            echo "AltTester Desktop not found. Searched: /Applications, \$HOME/Applications, and mdfind."
+            echo "Install it or set ALTTESTER_DESKTOP_APP to the .app path. See sample-unity6/Tests/README-ALTTESTER-MACOS.md"
             exit 1
           fi
           EXE="$ALT_APP/Contents/MacOS/AltTester Desktop"