Fix compute iOS CI

Author: Kyle-Ye

.github/workflows/compute.yml

@@ -83,4 +83,5 @@ jobs:
             -destination "platform=iOS Simulator,OS=${{ matrix.ios-version }},name=${{ matrix.ios-simulator-name }}" \
             -derivedDataPath .build-debug \
             -skipMacroValidation \
-            -skipPackagePluginValidation
+            -skipPackagePluginValidation \
+            OTHER_SWIFT_FLAGS="-warnings-as-errors"