[build] system/metallb: multiarch support

[nbykov0]

Add support for metallb multiarch build.

Part of #519 and a follow-up to PR #945 (issue #909)

Summary by CodeRabbit

• Chores
  • Improved Docker build process for image-controller and image-speaker to allow dynamic control over image loading and enhanced build configuration consistency. No changes to user-facing features.

[coderabbitai[bot]]

Walkthrough

The Makefile for MetalLB was updated to enhance the Docker build commands for the image-controller and image-speaker targets. This includes specifying builder and platform options, making the image loading behavior configurable, and adjusting command formatting for consistency.

Changes

File(s)	Change Summary
packages/system/metallb/Makefile	Enhanced Docker build commands: added --builder and --platform options, made --load flag configurable, and reformatted --label usage.

Possibly related PRs

• cozystack/cozystack#907: Introduced BUILDER and PLATFORM variables and used them in Docker build commands, directly relating to the Makefile enhancements for cross-architecture builds.

Suggested labels

ok-to-test

Poem

A bunny hopped by the Makefile’s line,
Tweaked the build with flags so fine.
Now platforms and builders are set with care,
And loading images is handled fair.
With Docker commands neat and new,
This rabbit says, “Great job to you!” 🐇

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