Add support for building a CAPI Azure image for ARM64

[abenn135]

Change description

Adds ARM64 image support for Azure.

• Is this change including a new Provider or a new OS? (y/n) y
• If yes, has the Provider/OS matrix been updated in the readme? (y/n) y
• If adding a new provider, are you a representative of that provider? (y/n) n (though I know the Azure provider folks)

Related issues

• Not a fix, but adds one ARM64 OS: Support building arm64 CAPI images #936

Additional context

[linux-foundation-easycla]

• ✅ login: abenn135 / name: Alex Benn (1456710, 534bd77, 5ec751b, 615d4d8, ad6fa8a, c07573a, c686a2f)
• ❌ The email address for the commit (11801c6, 1960eee, 9df2ab4, c6ddc48, dc0d1a2) is not linked to the GitHub account, preventing the EasyCLA check. Consult this Help Article and GitHub Help to resolve. (To view the commit's email address, add .patch at the end of this PR page's URL.) For further assistance with EasyCLA, please submit a support request ticket.

[k8s-ci-robot]

Hi @abenn135. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[k8s-ci-robot]

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[mboersma]

/ok-to-test

[k8s-ci-robot]

PR needs rebase.

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