Hi
The Slate AX does not have enough storage space to install Docker, which is why the relevant packages are not available in the our official repository.
root@GL-AXT1800:~# opkg install dockerd docker luci-app-dockerman
Installing dockerd (27.3.1-1) to root...
....
Collected errors:
* verify_pkg_installable: Only have 22064kb available on filesystem /overlay, pkg containerd needs 34735
* opkg_install_cmd: Cannot install package dockerd.
If you have already addressed this via extroot, you can refer to the following thread and use the OpenWRT feed sources to install the related packages - Kindly note that these are out of our support scope.