#1821 update Dockerfile to alwyas use head Alpine

[thelamer]

What type of PR is this?

/kind bug

What this PR does / why we need it:

This updates the current Dockerfile to support aarch64 and armv7 as well, it also bumps to always use head Alpine instead of the previous hard coded 3.9. Given your instructions only use busybox for the ability to cd into the /opt directory this can likely be based down to scratch with some minor doc updates, but that is not the purpose of this PR and the space savings are negligible to potentially break external workflows.

Which issue(s) this PR fixes:

Fixes #1821

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: thelamer / name: Ryan Kuba (61680d1)

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[cdrage]

Woo this is an awesome improvement! LGTM!

/approve

/lgtm

You'll just have to sign the CLI and this will be merged 🎉

[cdrage]

/approve

[cdrage]

/lgtm

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cdrage, thelamer

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