I copied my script in /opt/drbl/share/drbl/postrun/ and tested by run-parts --test /opt/drbl/share/drbl/postrun and it returned my script and without --test ran it.
I ran ocs-live and continued it in export mode -> recovery-iso-zip -> Select image -> ask_user -> and mark -o1 (postrun switch) and to end.
The problem starts here, after restoring of image, postrun notification comes(yellow message) but my script doesn't run and /opt/drbl/share/drbl/postrun is empty!
Furthermore I did chmod +x or chmod 755, but It doesn't work.