Flyctl deploy

Running into an issue when attempting to do a simple flyctl deploy (previously always working)

==> Verifying app config
Validating [dir]/fly.toml
Platform: machines
✓ Configuration is valid
--> Verified app config
==> Building image
WARN Failed to start remote builder heartbeat: server returned a non-200 status code: 500

Error: failed to fetch an image or build from source: error connecting to docker: server returned a non-200 status code: 500

There is already a thread for this that you might find useful.