build: add notes about matrix

Author: jpoehnelt

.github/workflows/test.yml

@@ -20,14 +20,14 @@ on:
   pull_request:
 jobs:
   test:
+    # temporarily use matrix until all are passing
     strategy:
       fail-fast: false
       matrix:
         folder:
           - adminSDK
           - advanced
           - ai
-          - apps-script
           - calendar
           - chat
           - classroom