Update /cmd: Switch from debian11 to debian12

[Kalaiselvi84]

What type of PR is this?

Uncomment only one /kind <> line, press enter to put that in a new line, and remove leading whitespace from that line:

/kind breaking
/kind bug
/kind cleanup
/kind documentation
/kind feature
/kind hotfix
/kind release

What this PR does / Why we need it:

Which issue(s) this PR fixes:

Work on #3570

Special notes for your reviewer:

[agones-bot]

Build Succeeded 👏

Build Id: fdd68d9f-0d51-4c5f-9365-a6ac561c1959

The following development artifacts have been built, and will exist for the next 30 days:

• image: us-docker.pkg.dev/agones-images/ci/agones-controller:1.38.0-dev-2e94b66-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-extensions:1.38.0-dev-2e94b66-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-sdk:1.38.0-dev-2e94b66-linux-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-ping:1.38.0-dev-2e94b66-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-allocator:1.38.0-dev-2e94b66-amd64
• Linux C++ SDK (build): agonessdk-1.38.0-dev-2e94b66-amd64-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.38.0-dev-2e94b66-amd64.zip

A preview of the website (the last 30 builds are retained):

• https://2e94b66-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/googleforgames/agones.git pull/3577/head:pr_3577 && git checkout pr_3577
• helm install agones ./install/helm/agones --namespace agones-system --set agones.image.registry=us-docker.pkg.dev/agones-images/ci --set agones.image.tag=1.38.0-dev-2e94b66-amd64

[markmandel]

If this is passing CI, then it's good to go 👍🏻

[agones-bot]

Build Succeeded 👏

Build Id: 73400b13-909b-4c2c-9d01-b5069a2ec874

The following development artifacts have been built, and will exist for the next 30 days:

• image: us-docker.pkg.dev/agones-images/ci/agones-controller:1.38.0-dev-1f7baee-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-extensions:1.38.0-dev-1f7baee-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-sdk:1.38.0-dev-1f7baee-linux-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-ping:1.38.0-dev-1f7baee-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-allocator:1.38.0-dev-1f7baee-amd64
• Linux C++ SDK (build): agonessdk-1.38.0-dev-1f7baee-amd64-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.38.0-dev-1f7baee-amd64.zip

A preview of the website (the last 30 builds are retained):

• https://1f7baee-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/googleforgames/agones.git pull/3577/head:pr_3577 && git checkout pr_3577
• helm install agones ./install/helm/agones --namespace agones-system --set agones.image.registry=us-docker.pkg.dev/agones-images/ci --set agones.image.tag=1.38.0-dev-1f7baee-amd64