Disabled the newer iOS 27 app icon in the github workflow until Xcode 27 is available on github

Author: OGSarah

.github/workflows/tests.yml

@@ -29,14 +29,19 @@ jobs:
           swift --version
 
       - name: Build and test
+        # The app icon is an Icon Composer .icon authored by a newer toolchain
+        # than the runner's actool, which crashes compiling it. The icon is not
+        # needed to run unit tests, so it is disabled for the CI build only.
         run: |
           xcodebuild test \
             -project JSONParser/JSONParser.xcodeproj \
             -scheme JSONParser \
             -destination 'platform=macOS' \
             -only-testing:JSONParserTests \
             -resultBundlePath TestResults.xcresult \
-            CODE_SIGNING_ALLOWED=NO
+            CODE_SIGNING_ALLOWED=NO \
+            ASSETCATALOG_COMPILER_APPICON_NAME= \
+            ASSETCATALOG_COMPILER_INCLUDE_ALL_APPICON_ASSETS=NO
 
       - name: Upload test results
         if: always()