Older 32-bit versions of Raspberry Pi OS may be incompatible with docker images based on Alpine 3.13 and older. This is due to the bug in the libseccomp2 library, which docker depends on. The issue has been discussed in GitHub and fixed since then. Unfortunately, the fix has not been pushed to all repos and exists for older versions of Raspberry Pi OS. Luckily, it can be easily fixed by adding a backports repo and updating the library from it:
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 04EE7237B7D453EC 648ACFD622F3D138
echo "deb http://deb.debian.org/debian buster-backports main" | sudo tee -a /etc/apt/sources.list.d/buster-backports.list
sudo apt update
sudo apt install -t buster-backports libseccomp2This is not the only solution and others can be found [here](https://docs.linuxserver.io/faq#libseccomp).