Add automatic platform args in the global scope

[grooverdan]

Based on https://docs.docker.com/engine/reference/builder/#automatic-platform-args-in-the-global-scope

By default assumed build platform = target platform as builder doesn't [yet?] gave platform.

[openshift-ci-robot]

Hi @grooverdan. Thanks for your PR.

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[TomSweeneyRedHat]

/ok-to-test

[TomSweeneyRedHat]

In Docker, this is only supported starting with v18.09 while using BuildKit. The changes here look reasonable to me, @nalind WDYT?

[rhatdan]

@mrunalp WDYT?

[grooverdan]

Any objections @nalind, @mrunalp ?

[rhatdan]

/approve

[grooverdan]

So this is missing some /lgtm and removing the /size/xxl ❤️ .

[grooverdan]

/joke

[openshift-ci-robot]

@grooverdan: Why did the man run around his bed? Because he was trying to catch up on his sleep!

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[grooverdan]

🚥

/joke

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[grooverdan]

Can you push the vendor github.com/containerd/containerd updates separately? Then I can remove that from the series. That will remove the size/XXL tag enabling this to be merged.

[TomSweeneyRedHat]

@nalind @mrunalp @RedHatDan PTAL

[rhatdan]

/lgtm

[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: grooverdan, rhatdan

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[TomSweeneyRedHat]

And scrolling back I realize I never LGTM'd. So doing so now.
LGTM