chore(docs): Some (small) improvements to the Makefile

[8R0WNI3]

What this PR does / why we need it:

• Use docker-buildx for image build
• Use a multi-platform build by default (match GitHub-Actions settings)
• Properly cleanup all build artifacts

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:

Release note:

[coderabbitai]

📝 Walkthrough

Walkthrough

The Makefile now builds Docker images for Linux amd64 and arm64 with Buildx. The clean target now removes src/*.egg-info artifacts.

Changes

Build maintenance

Layer / File(s)	Summary
Makefile target updates Makefile	The Docker build target uses docker-buildx build for linux/amd64 and linux/arm64. The clean target removes src/*.egg-info files.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Suggested reviewers: a-thaler

Poem

A rabbit checks the build with care,
Two sturdy platforms fill the air.
Old egg-info hops away,
Clean paths greet the working day.
Buildx leads the way!

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title identifies the Makefile improvements and matches the pull request changes, although the docs scope is slightly imprecise.
Description check	✅ Passed	The description covers the buildx, multi-platform build, cleanup, and release note changes; the issue and reviewer notes sections are empty.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[coderabbitai]

Actionable comments posted: 2

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@Makefile`:
- Line 106: Update the build command invoking Buildx to use the Docker CLI form,
`docker buildx build`, instead of the standalone `docker-buildx build`
executable.
- Around line 106-109: Update the docker-buildx build invocation to use a
compatible multi-platform output: add --push when producing a registry manifest,
or use --load only if this target is intended to create a local single-platform
image. Ensure the selected output matches the target’s expected image
consumption.

🪄 Autofix

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: ce7bdfc5-9fe6-4833-9185-eaa82eaf53c8

📥 Commits

Reviewing files that changed from the base of the PR and between 525910b and 624c04d.

📒 Files selected for processing (1)

• Makefile

[ChrisSchneider]

/lgtm