Add flag_check.py to the preupload

Bug: 273661677
Test: repo upload .
Flag: not needed, python script for repo hook
Change-Id: Ieb48c7ab59b2dffbbf47e3ee0a45698e9adfda9c
diff --git a/PREUPLOAD.cfg b/PREUPLOAD.cfg
index a77791f..908ec0b 100644
--- a/PREUPLOAD.cfg
+++ b/PREUPLOAD.cfg
@@ -1,4 +1,6 @@
 [Hook Scripts]
 checkstyle_hook = ${REPO_ROOT}/prebuilts/checkstyle/checkstyle.py --config_xml tools/checkstyle.xml --sha ${PREUPLOAD_COMMIT}
 
-ktfmt_hook = ${REPO_ROOT}/external/ktfmt/ktfmt.py --check ${PREUPLOAD_FILES}
\ No newline at end of file
+ktfmt_hook = ${REPO_ROOT}/external/ktfmt/ktfmt.py --check ${PREUPLOAD_FILES}
+
+flag_hook = ${REPO_ROOT}/vendor/unbundled_google/packages/NexusLauncher/flag_check.py ${PREUPLOAD_COMMIT_MESSAGE}