Blockers for systemd in v25.06

Due to things like phosh, flatpak breaking badly due to upstream changes not reflected in systemd-services (!6044 (closed) #3475 (closed)), we need a better way than this. Things that I feel need to happen before we can publish systemd with v25.06.

• abuild's systemd subpackage support (@craftyguy is working on it)

  • moving systemd-services as much as possible to aports

• monitoring for outdated packages, needs one of:

  • in gitlab upstream_compat (WIP patch by @jane400 here
  • anyita integration

• utmps

• syslog daemon (all pam extensions log to that!)

  • fixed by !6156 (merged) , journald is a also syslog daemon. the internet spreads misinformation.

• marking system units which need reloading/restarting, then applying it after upgrading everything.

  • this is probably best supported by systemd (systemctl daemon-reexec), we shouldn't touch unsupported services
  • things like https://src.fedoraproject.org/rpms/systemd/blob/rawhide/f/systemd.spec#_1138
  • things systemd_*with{restart,reload} in fedora

Optional, but we should really have this:

• usr-merge in alpine