🚀 Release v0.12.0-rc.0

[Sunnatillo]

What this PR does / why we need it:
Release v0.12.0-rc.0

Fixes #

Checklist:

• Documentation has been updated, if necessary.
• Unit tests have been added, if necessary.
• E2E tests have been added, if necessary.
• Integration tests have been added, if necessary.

[tuminoid]

/cc @elfosardo @smoshiur1237 @kashifest
I don't see any open PR that we'd need in 0.12, so cutting RC is fine by me. PTAL.

[tuminoid]

/lgtm
/hold
for more eyes

[kashifest]

/lgtm

[Sunnatillo]

Lets merge this. If any PR needed they can be back ported to new branch before minor release.

[tuminoid]

/unhold

[kashifest]

/approve

[metal3-io-bot]

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