Use buildx for cross-platform builds

[tumberino]

Use Docker buildx build tooling to create multi-arch manifest instead of manually adding images.

Test build: https://hub.docker.com/r/jamesnelson/metrics-scraper/tags

Fixes: #54

Signed-off-by: James Tumber james.tumber@ibm.com

[linux-foundation-easycla[bot]]

• :x: - login: @jtumber-ibm / name: James 'JT' Tumber . The commit (b08b56992499af690c435e047be80b9f77d290d0) is not authorized under a signed CLA. Please click here to be authorized. For further assistance with EasyCLA, please submit a support request ticket.

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[floreks]

Nice work! Can you please sign the CLA?

[tumberino]

Nice work! Can you please sign the CLA?

Yeah, working on it but need to be added to IBM org for it.

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