kill XProtect to avoid malware scan of dmg image (#1659) (#1661)

Co-authored-by: Rex Schilasky <[email protected]>

.github/workflows/build-macos.yml

@@ -11,6 +11,13 @@ jobs:
  runs-on: macos-13
 
  steps:
+ # XProtect can cause random failures if it decides that the DMG we create
+ # during the packaging phase is malware.
+ # See https:/actions/runner-images/issues/7522 and https:/servo/servo/pull/30779
+ - name: Kill XProtectBehaviorService
+ run: |
+ echo Killing XProtect.; sudo pkill -9 XProtect >/dev/null || true;
+
  - name: Downgrade Python version
  uses: actions/setup-python@v4
  id: cp39