Fix stdin regression with docker

[phaseOne]

On my machine running Docker Desktop for ARM Mac 4.11.1 (84025), running balena preload gets stuck at Reading image information.

% balena preload …
| Checking that the image is a writable file
| Finding a free tcp port
| Checking if the image is an edison zip archive
/ Creating preloader container
| Starting preloader container
- Fetching application USER/APP
- Reading image information

The cause is that the container never receives data on stdin, so preload.py remains idle.

Speculation suggests that this broke with Docker Desktop 4.10.0 based on moby/moby#43799. I've also submitted an upstream PR to apocas/docker-modem#148 to make the change in this PR the default, but I'm submitting this PR in hopes to resolve the issue for balena users faster.

For future refactors, I suggest adding additional logging in preload.py that's more helpful than what I've contributed in this PR.

[aethernet]

Hello,

I recreated your PR here as it needs a Change-type to be pass our CI process.

Thanks for the fix, helps a lot !!