Pushing images to ECR and Docker Hub times out

[euanh]

Description

Pushing images to ECR and Docker Hub times out, or fails with cryptic errors.

Reproduction

Try to push one of the example projects to ECR or Docker Hub.

Package versions

% swift sdk list
swift-6.0.1-RELEASE_static-linux-0.0.1

Expected behavior

It should be possible to push to any registry.

Environment

Xcode 16

% echo $TOOLCHAINS
org.swift.6010202409231a

Additional information

Pushing to a local registry succeeds, as does pushing to some other network-hosted registries.
In the failing case, small blobs such as config objects are uploaded correctly. An artificially small image layer containing just a text file also succeeds. Large blobs, such as static binaries or base image layers, fail to upload.

I suspect containertool is not sending streaming uploads, and the registries, or load balancers in front of them, are rejecting the uploads for being too large.

The problem with ECR was reported in #14