Update kubectl Linux install page to dearmor GPG public key for Debian

[guettli]

Without this fix you get:

Err:1 https://packages.cloud.google.com/apt kubernetes-xenial InRelease
  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY B53DC80D13EDEF05
Reading package lists... Done
W: GPG error: https://packages.cloud.google.com/apt kubernetes-xenial InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY B53DC80D13EDEF05
E: The repository 'https://apt.kubernetes.io kubernetes-xenial InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.

The new line was copied from here: https://github.com/kubernetes/website/blob/main/content/en/docs/setup/production-environment/tools/kubeadm/install-kubeadm.md?plain=1#L157

This PR is about this related issue: 41334

[dipesh-rawat]

@guettli Changes look fine.

I see the bot has added do-not-merge/invalid-commit-message as the commit message has fixes#<issue number> (Blocked Keywords Guide). Would you be able to edit the commit message in order to move this PR forward?

[guettli]

@dipesh-rawat I fixed the commit message. The label was removed

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[dipesh-rawat]

Thanks for fix. The change appears satisfactory from my perspective.
/lgtm

Deploy Preview: deploy-preview-41339-install-kubectl-linux

[sftim]

/retitle Update kubectl Linux install page to dearmor GPG public key for Debian

Thanks

/approve

[sftim]

/hold

[sftim]

Oops. The commit message still references an issue. Could you remove that mention from the commit message description @guettli? We prefer to omit that.

/lgtm cancel
/approve cancel

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[sftim]

/hold cancel

[guettli]

@sftim if you prefer it differently, then please do it. Please take my change request and merge it, or don't. I just don't get why these rules exit. I guess it should be doable to configure GitHub so that it does not automatically closes the issue if the commit messages contains "fixes #12346789"

[sftim]

I guess it should be doable to configure GitHub so that it does not automatically closes the issue if the commit messages contains "fixes #12346789"

The problem isn't automatically closing the issue; it's the behavior for forks of Kubernetes.

I'll add a note to the issue that a new PR is welcome.

[sftim]

We merged a similar but different fix.

/close

Thank you for your work on this @guettli

[k8s-ci-robot]

@sftim: Closed this PR.

In response to this:

We merged a similar but different fix.

/close

Thank you for your work on this @guettli

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