The use of a re-badged buildbox image (rebadging quay.io/gravitational/teleport-buildbox to us-docker.pkg.dev/ci-account/teleport/buildbox-root) is holdover from when CI builds required separate "root user" and "non-root user" images to execute tests under different contexts.
This requirement has since been lifted by using a Go-based build script in CI, and the having to manually invoke a process to re-badge the buildboxes is, tedious, confusing and causing stoppages.
This patch restores the use of buildboxes from quay.io in CI.
Trent Clarke