Write ssh information in a writable area.

etc/systemd/system/sshd.service.d/stormux-hostkeys.conf

@@ -0,0 +1,5 @@
+[Unit]
+Wants=
+Wants=stormux-sshd-hostkeys.service ssh-access.target
+After=
+After=network.target stormux-sshd-hostkeys.service

etc/systemd/system/stormux-sshd-hostkeys.service

@@ -0,0 +1,7 @@
+[Unit]
+Description=Generate persistent Stormux SSH host keys
+RequiresMountsFor=/home/stormux/.local/etc/ssh
+
+[Service]
+Type=oneshot
+ExecStart=/usr/lib/stormux/stormux_sshd_hostkeys.sh