ANDROID: drm_hwcomposer: Add pre-push hook

Add a pre-push hook to detect commits that are prefixed with ANDROID:,
and prevent them from being pushed to a potentially public remote.

Add a script to install the pre-push hook.

Add a PREUPLOAD hook that checks that the pre-push hook has been
installed. Since this hook needs to be installed manually, the PREUPLOAD
hook will remind contributors to install the next time they attempt to
`repo upload`.

Test: `git push -n $gitlab-remote`
Test: `git push -n aosp`
Test: repo upload
Bug: 371583224

Change-Id: I4a07c2938417e5983b66ce67e375c8fced5a4007
diff --git a/PREUPLOAD.cfg b/PREUPLOAD.cfg
new file mode 100644
index 0000000..1f413f7
--- /dev/null
+++ b/PREUPLOAD.cfg
@@ -0,0 +1,3 @@
+[Hook Scripts]
+
+check hooks installed = hooks/check-hooks-installed
\ No newline at end of file