Merge pull request #641 from wordpress-mobile/use/xcode-15.1

Use Xcode 15.0.1

Author: jkmassel

.buildkite/pipeline.yml

@@ -4,7 +4,7 @@ common_params:
     - automattic/a8c-ci-toolkit#2.18.2
   # Common environment values to use with the `env` key.
   env: &common_env
-    IMAGE_ID: xcode-14.3.1
+    IMAGE_ID: xcode-15.0.1
 
 # This is the default pipeline – it will build and test the app
 steps:
@@ -18,6 +18,7 @@ steps:
       - fastlane/test_output/*.xcresult.zip
       - fastlane/test_output/report.html
       - fastlane/test_output/report.junit
+      - .build/derived-data/Logs/**/*.xcactivitylog
     env: *common_env
     plugins: *common_plugins