main/aports-build: fix rsync mqtt notifications

use the directory as payload for the rsync notification instead of
commit. This makes it easier for mirrors to know what to sync.

(cherry picked from commit 7e4ba8d75c2f8d118c50938a052d6a798fb86a3a)

Conflicts:
	main/aports-build/APKBUILD
	main/aports-build/aports-build