The WSL section of AlmaLinux Wiki has a comprehensive guide which covers from installation of WSL and distributions like AlmaLinux OS to extras features like running GUI apps and Docker desktop integration: https://wiki.almalinux.org/documentation/wsl.html
Publishing is done by creating pull requests on https://github.com/microsoft/WSL to update the distributions manifest, which is used by wsl command-line tool during the download and installation.
These images can also be downloaded from the releases section of this GitHub repository, which can be useful for offline installations via wsl --install --from-file.
The docs directoy is used to store documentation about how building, testing and publishing is done.