fix(ci): disable code signing for test workflow

The test workflow was failing with exit code 65 because the project
requires code signing with a specific development team certificate
not available on GitHub Actions runners.

Author: eddmann

.github/workflows/test.yml

@@ -30,4 +30,7 @@ jobs:
           xcodebuild test \
             -project ClaudeMeter.xcodeproj \
             -scheme ClaudeMeter \
-            -configuration Debug
+            -configuration Debug \
+            CODE_SIGN_IDENTITY="-" \
+            CODE_SIGNING_REQUIRED=NO \
+            CODE_SIGNING_ALLOWED=NO