# Summary
This PR addresses failures to run Yggdrasil on ARM systems. The root
cause was the lack of ARM artifacts/images, which led to exec format
error and similar issues.
## What’s added:
- ```Dockerfile.multiarch``` — multi-stage Go build that correctly
propagates GOOS/GOARCH for linux/amd64, linux/arm64, linux/armhf and
linux/armel platform.
- ```entrypoint.sh``` - Introduced ENV **ALLOW_IPV6_FORWARDING**. When
set to a truthy value (e.g., true), the entrypoint executes: ```sysctl
-w net.ipv6.conf.all.forwarding=1```.
- GitHub Action for multi-arch builds and publishing to GHCR — triggered
via ```workflow_dispatch```, push to ```master``` and release via tags
(with docker semantic tags e.g. v0.5.12 → 0.5.12, 0.5, 0).
Example published images:
[https://github.com/Forne/yggdrasil-go/pkgs/container/yggdrasil-go](https://github.com/Forne/yggdrasil-go/pkgs/container/yggdrasil-go)
## Testing
✅ Ubuntu (24.04, amd64) — image runs correctly.
✅ macOS (Apple Silicon, arm64) — image runs correctly.
✅ MikroTik RouterOS (arm64) — image runs under the RouterOS container
package.
This PR updates Ironwood to include the new RTT-based link costing and
updates `yggdrasilctl` to report the cost in `getPeers`.
Co-authored-by: Neil Alexander <neilalexander@users.noreply.github.com>
