Use drop-in files for journald and logind configuration

configs/releng/airootfs/etc/systemd/journald.conf.d/volatile-storage.conf

+[Journal]
+Storage=volatile

configs/releng/airootfs/etc/systemd/logind.conf.d/do-not-suspend.conf

+[Login]
+HandleSuspendKey=ignore
+HandleHibernateKey=ignore
+HandleLidSwitch=ignore

configs/releng/airootfs/root/customize_airootfs.sh

@@ -15,11 +15,6 @@ passwd -d root
 
 sed -i 's/#\(PermitRootLogin \).\+/\1yes/' /etc/ssh/sshd_config
 sed -i "s/#Server/Server/g" /etc/pacman.d/mirrorlist
-sed -i 's/#\(Storage=\)auto/\1volatile/' /etc/systemd/journald.conf
-
-sed -i 's/#\(HandleSuspendKey=\)suspend/\1ignore/' /etc/systemd/logind.conf
-sed -i 's/#\(HandleHibernateKey=\)hibernate/\1ignore/' /etc/systemd/logind.conf
-sed -i 's/#\(HandleLidSwitch=\)suspend/\1ignore/' /etc/systemd/logind.conf
 
 systemctl enable pacman-init.service choose-mirror.service systemd-networkd.service systemd-resolved.service
 systemctl set-default multi-user.target