ci: use -sdk iphoneos for Capacitor iOS build (avoids simulator runtime requirement)

Author: j3k0

.github/workflows/build-capacitor-ios.yml

@@ -51,5 +51,7 @@ jobs:
           cd test-cap-app/ios/App
           xcodebuild build \
             -scheme App \
-            -destination 'generic/platform=iOS Simulator' \
+            -sdk iphoneos \
+            CODE_SIGN_IDENTITY="" \
+            CODE_SIGNING_REQUIRED=NO \
             CODE_SIGNING_ALLOWED=NO