ci: allow to run scheduled workflow

This is for testing only and will be removed

Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>

Author: kolyshkin

.github/workflows/scheduled.yml

@@ -3,6 +3,7 @@ on:
   schedule:
     # Runs at 00:00 UTC every Sunday, Tuesday, Thursday.
     - cron: '0 0 * * 0,2,4'
+  workflow_dispatch: # XXX for test only, remove this line later.
 permissions:
   contents: read
   actions: write