Add ARM build

[dewijones92]

This pull request updates the Makefile to use docker buildx for building Docker images. This change allows us to build multi-platform Docker images for both linux/amd64 and linux/arm64 architectures. This enhancement ensures broader compatibility and support for different environments.

Related Issue or Design Document

This change implements a new feature to support multi-platform Docker builds. No specific issue or design document is linked.

Checklist

• I have read the contributing guidelines and signed the CLA.
• I have referenced an issue containing the design document if my change introduces a new feature.
• I have read the security policy.
• I confirm that this pull request does not address a security vulnerability.
  If this pull request addresses a security vulnerability,
  I confirm that I got approval (please contact [email protected]) from the maintainers to push the changes.
• I have added tests that prove my fix is effective or that my feature works.
• I have added the necessary documentation within the code base (if appropriate).

Further comments

This change was made to ensure that our Docker images are compatible with both linux/amd64 and linux/arm64 architectures. The use of docker buildx was chosen because it provides a straightforward way to build multi-platform images. An alternative approach could have been to maintain separate Dockerfiles for each architecture, but this would have increased maintenance complexity.

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[aeneasr]

Thank you, this looks great! Could you please sign the CLA (just two clicks), then we can merge it right away!