Just for documentation, maybe its useful for others.
cat /etc/os-release
NAME="TurrisOS"
VERSION="4.0.1"
ID="turrisos"
ID_LIKE="lede openwrt"
PRETTY_NAME="TurrisOS 4.0.1"
VERSION_ID="4.0.1"
HOME_URL="https://www.turris.cz/"
BUG_URL="https://gitlab.labs.nic.cz/groups/turris/-/issues"
SUPPORT_URL="https://www.turris.cz/support/"
BUILD_ID="6dd7d54"
LEDE_BOARD="mvebu/cortexa53"
LEDE_ARCH="aarch64_cortex-a53"
LEDE_TAINTS="busybox"
LEDE_DEVICE_MANUFACTURER="CZ.NIC"
LEDE_DEVICE_MANUFACTURER_URL="https://www.turris.cz"
LEDE_DEVICE_PRODUCT="Turris Mox"
LEDE_DEVICE_REVISION="v0"
LEDE_RELEASE="TurrisOS 4.0.1 6dd7d54"
opkg install
kmod-veth
gnupg
gnupg-utils
lxc lxc-attach
lxc-autostart
lxc-cgroup
lxc-checkconfig
lxc-clone
lxc-common
lxc-config
lxc-configs
lxc-console
lxc-create
lxc-destroy
lxc-execute
lxc-freeze
lxc-hookslxc-info
lxc-init
lxc-ls
lxc-lua
lxc-monitor
lxc-monitord
lxc-snapshot
lxc-start
lxc-stop
lxc-templates
lxc-unfreeze
lxc-unshare
lxc-user-nic
lxc-usernsexec
lxc-wait
lxc-unshare
lxc-copy
Disclaimer: I did not check which of the LXC-Packages are really necessary. But I needed to install the kernel module, and gnupg was necessary in order to create containers using the cli