Boots into initramfs then switch_root

alpine/rootfs-extra/etc/fstab

@@ -1,3 +1,7 @@
-PARTLABEL=config               /opt/monok8s/config   vfat    defaults,noatime               0      0
-PARTLABEL=data                 /data                 ext4    defaults,noatime               0      21
-/data/var                      /var                  none    rbind,noatime                  0      0
+PARTLABEL=config  /opt/monok8s/config  vfat  defaults,noatime                          0  0
+PARTLABEL=data    /data                ext4  rw,noatime,nodiratime                     0  0
+
+/data/var         /var                 none  rbind                                     0  0
+
+tmpfs             /run                 tmpfs defaults,nosuid,nodev,mode=0755           0  0
+tmpfs             /tmp                 tmpfs defaults,nosuid,nodev,noexec,mode=1777    0  0

alpine/rootfs-extra/etc/init.d/root.override

@@ -0,0 +1,16 @@
+#!/sbin/openrc-run
+
+description="Keep root filesystem read-only for immutable boot"
+
+depend()
+{
+	after clock
+	need fsck
+	keyword -docker -podman -jail -lxc -openvz -prefix -systemd-nspawn -vserver -wsl
+}
+
+start()
+{
+	ebegin "Keeping root filesystem read-only"
+	eend 0
+}