As root:
podman run --privileged -t -v earthly-tmp:/tmp/earthly:rw -e BUILDKIT_TCP_TRANSPORT_ENABLED=true -p 8372:8372 earthly/buildkitd:v0.6.30
As normal user: Set the environment variable $EARTHLY_BUILDKIT_HOST or:
earthly --buildkit-host tcp://<myhostname>:8372 +all-build