Fly is working on a “serverless” offering that’d suit unikernels (probably as a function-as-a-service) a bit better: Tease us with more "machine" info?
Till that becomes a reality, I’ve restored to deploying distroless containers to Fly today for DNS workloads I run (written in golang), and the resulting image size is less than 10MiB, iirc. Though, note that Fly doesn’t itself run docker images as-is.