.github: Add sys-apps/systemd to automation

Signed-off-by: Krzesimir Nowak <[email protected]>

Author: krnowak

.github/workflows/portage-stable-packages-list

@@ -625,6 +625,7 @@ sys-apps/sed
 sys-apps/semodule-utils
 sys-apps/shadow
 sys-apps/smartmontools
+sys-apps/systemd
 sys-apps/texinfo
 sys-apps/usbutils
 sys-apps/util-linux