Add pacman-syncdb: systemd service and timer for `pacman -Fy`.
`pacman -Fy` is a modern replacement for `pkgfile`. This service/timer makes `pacman -Fy` have feature parity with `pkgfile`. The unit files were based on both pkgfile and paccache, for consistency with the existing ecosystem. Context: https://bbs.archlinux.org/viewtopic.php?pid=1981076 : https://wiki.archlinux.org/title/Pacman#Search_for_a_package_that_contains_a_specific_file Signed-off-by: Thiago Perrotta <email@example.com> Signed-off-by: Daniel M. Capella <firstname.lastname@example.org>