ci: move to Xcode Cloud, pin TelemetryDeck for SPM resolution

CONTRIBUTING.md

@@ -61,7 +61,9 @@ CheatSheet builds and tests on Xcode Cloud, not GitHub Actions. Every push to
 `develop` or `main`, and every pull request against them, triggers a build.
 Xcode Cloud regenerates the project from `project.yml` on clone
 (`ci_scripts/ci_post_clone.sh`), so nothing needs to change in that script when
-adding new source files.
+adding new source files. The UI test gate uses the `CheatSheetiOSUISmoke`
+scheme, which skips `testQASweep` and `MarketingScreenshotTests`; run those on
+demand through `CheatSheetiOSUI` with `-only-testing`.
 
 ## Widget Signing
 

ci_scripts/ci_post_clone.sh

@@ -19,6 +19,15 @@ fi
 cd "$CI_PRIMARY_REPOSITORY_PATH"
 xcodegen generate --spec project.yml --project . --project-root .
 
+# Xcode Cloud disables automatic SPM resolution and requires a resolved
+# manifest to already exist at this path before it will build
+# (https://developer.apple.com/documentation/xcode/making-dependencies-available-to-xcode-cloud).
+# CheatSheet.xcodeproj is gitignored, so this pin can't live at its normal
+# location in the repo; keep the source of truth in ci_scripts/ and copy it
+# into place right after the project is generated.
+mkdir -p CheatSheet.xcodeproj/project.xcworkspace/xcshareddata/swiftpm
+cp ci_scripts/Package.resolved CheatSheet.xcodeproj/project.xcworkspace/xcshareddata/swiftpm/Package.resolved
+
 # Fail loudly if the workflow's Environment tab picked an SDK major CheatSheet
 # does not expect (a beta, or a version this branch has not been updated for),
 # rather than silently archiving something that will bounce at App Store

project.yml

@@ -258,3 +258,22 @@ schemes:
         - CheatSheetiOSUITests
     run:
       config: Debug
+  # Xcode Cloud's Test action cannot pass -skip-testing, so the gate the
+  # retired GitHub Actions pipeline ran lives here as scheme skips instead.
+  # Skip by name, never allow-list: new UI test classes run automatically.
+  # testQASweep (flaky screenshot monolith) and MarketingScreenshotTests
+  # (App Store captures) stay on demand via CheatSheetiOSUI and -only-testing.
+  CheatSheetiOSUISmoke:
+    build:
+      targets:
+        CheatSheetiOS: all
+        CheatSheetiOSWidgets: all
+        CheatSheetiOSUITests: testing
+    test:
+      targets:
+        - name: CheatSheetiOSUITests
+          skippedTests:
+            - CheatSheetiOSUITests/testQASweep()
+            - MarketingScreenshotTests
+    run:
+      config: Debug