Is this released in 2.8.1. I got the same issue, and here is my config:

# Credentials for your image host.
registry:
  server: "localhost:5555"

# Configure the image builder.
builder:
  # Build for the server's native architecture (aarch64 == arm64)
  arch: arm64
  # Enable a registry cache so apt/bundler layers can be reused across deploys.
  cache:
    type: registry
    # Use an arch-specific cache image to avoid mixing caches across platforms
    image: tuyenhx/async_example-buildcache-arm64
    options: mode=max,image-manifest=true,oci-mediatypes=true

  remote: ssh://root@46.224.21.86
  local: false

thanks @djmb I tested this branch

It now works when I deploy from my mac but it fails when I deploy from the CI

To add more context
Mac: arm64
Host : amd64
CI: amd64

I tried both with local: true and false and the results where the same

Here is the draft PR rubyevents/rubyevents#1096

and the kamal config https://github.com/rubyevents/rubyevents/blob/main/config/deploy.staging.yml

let me know if you want me to run any more tests

@adrienpoly - I only see remote builds failing in the action tab. I think the "connection reset by peer" error probably indicates that port forwarding was initially set up correctly, so possibly the SSH connection is being dropped?

I've added the keepalive configuration, hopefully that might fix it, but I've also added some logging for any errors in the port forwarding thread, if anything goes wrong there right now I think we are missing it.

Could you try building with this branch again when you have a chance?