Added zfs-load-key.service

Source: https://wiki.archlinux.org/title/ZFS#Unlock_at_boot_time:_systemd

zfs-load-key.service

@@ -0,0 +1,14 @@
+[Unit]
+Description=Load encryption keys
+DefaultDependencies=no
+After=zfs-import.target
+Before=zfs-mount.service
+
+[Service]
+Type=oneshot
+RemainAfterExit=yes
+ExecStart=/usr/bin/zfs load-key -a
+StandardInput=tty-force
+
+[Install]
+WantedBy=zfs-mount.service