====== Buildx issues ======

===== extremely slow loadin metadata =====

<code bash>
[+] Building 3.4s (2/3)
 => [internal] load build definition from Dockerfile
 => [internal] load metadata for docker.io/library/python:3.9-alpine
</code>

There is not IP traffic to ''docker.io'' host!

Reason: registry mirror was set in ''/etc/docker/daemon.json'', but access to this registry was blocked on FW.