add proxy_env variable to apt_key cleanup task

[SamuelBECK1]

What type of PR is this?
/kind bug

What this PR does / why we need it:
apt_key cleanup task (here: roles/container-engine/cri-o/tasks/cleanup.yaml fail in environments behind an http proxy

Which issue(s) this PR fixes:

Fixes #9765

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

Add proxy_env variable to apt_key cleanup task

[k8s-ci-robot]

Hi @SamuelBECK1. 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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[SamuelBECK1]

/kind bug

[yankay]

/ok-to-test

[oomichi]

This adds the same one as the other task ensure docker-ce repository public key is installed.

/lgtm

[floryut]

@SamuelBECK1 Thank you for the PR 🥂

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: floryut, SamuelBECK1

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