[docker] Ability to define GPG key path for Docker APT

[emiran-orange]

What type of PR is this?
/kind feature

What this PR does / why we need it:
Enables setting a path for GPG key for Docker repo on Debian systems to avoid the well-known warning (Key is stored in legacy trusted.gpg keyring (/etc/apt/trusted.gpg), see the DEPRECATION section in apt-key(8) for details)

Which issue(s) this PR fixes:
NONE

Special notes for your reviewer:
NONE

Does this PR introduce a user-facing change?:

[docker] Ability to define GPG key path for Docker APT (using new variable `docker_repo_key_keyring`)

[k8s-ci-robot]

Hi @emiran-orange. 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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[yankay]

Thanks @emiran-orange

Would you please slash the commits.

/ok-to-test

👍👍

[emiran-orange]

Would you please slash the commits.

@yankay I think it's done now

[emiran-orange]

@yankay It just came to mind that some test cases (Debian 12 and/or Ubuntu 22.04) may be updated to use the variable... WDYT ?

[yankay]

@yankay It just came to mind that some test cases (Debian 12 and/or Ubuntu 22.04) may be updated to use the variable... WDYT ?

Thanks, It's good idea for me :-)

/lgtm

[emiran-orange]

@yankay Just added the var in packet_debian12-docker.yml and packet_ubuntu22-aio-docker.yml, does it still lgty ?

[floryut]

@emiran-orange Thank you for the PR

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: emiran-orange, floryut

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[yankay]

Thanks @emiran-orange

/lgtm