Preview release for Rancher Desktop

Just a place to publish new ISOs for Rancher Desktop testing.

New features:

• Uses custom lima-init instead of cloud-init
• Supports aarch64 binaries via qemu-user and binfmt_misc
• Includes ca-certificates packages for installing custom CA certs
• Bundles all required packages (e.g. sshfs)

Initial release

This is just an alpha release to share some ISO images for testing.