containerd: simplify registry mirror template

[clwluvw]

What type of PR is this?
/kind cleanup

What this PR does / why we need it:
Simplify registry mirror rendering in config.toml

Does this PR introduce a user-facing change?:

NONE

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: clwluvw / name: Seena Fallah (4fb0cf1)

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[k8s-ci-robot]

Hi @clwluvw. Thanks for your PR.

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: clwluvw
Once this PR has been reviewed and has the lgtm label, please assign oomichi for approval. For more information see the Kubernetes Code Review Process.

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[yankay]

/ok-to-test

[ant31]

/retest

[ant31]

/lgtm

[mzaian]

Thanks a lot @clwluvw

Could you please write a proper release note.

[kundan2707]

very simple and clean login
thanks

[kundan2707]

/lgtm

[VannTen]

Could you edit your commit message (or alternatively add a comment in the code) to explain why the end result is functionally identical ? Why I think I get the gist of it, it's not completely trivial so it's best to help future reader of the code understand why it is this way.