How to expand root partition
and to run the docker
you really need to upgrade, unless you're not running any official version of openwrt.
Installed "Firmware OpenWrt Install URL" running on the raspberrypi 4
not recently, then the URLs in your photo wouldn't say 21.02.1.
but since this is a SD card, remove if, and resize it using gparted, or fdisk + resize2fs.
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