The self-hosted runner is 0.1.1: the 0.1.0 release still packs artifacts with tar, which on Windows read a drive letter as a remote host and failed the desktop release's Windows job after the installer was built; runners update themselves to this release, which packs artifacts as ZIP in the runner itself.
description = "The program inside a g1t sandbox: runs an agent, checks, a catch-up merge, a review or a GitHub Actions job, and reports back. Also the self-hosted runner, g1t-runner register/run, on your own machines."