Create CI component for multi-arch image builds using Docker buildx

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Problem

We're currently missing a CI template that can be used to demonstrate how to build multi-arch Docker images using buildx.

Proposal

Add a new component to the GitLab.com CI/CD component catalog that illustrates how to leverage GitLab CI to build multi-arch images. As a plus, we can hint at the possibility of using one job per target architecture, likely relying on build matrixes.