Release 1.13.0

[markmandel]

What type of PR is this?

Uncomment only one /kind <> line, hit 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:

It's the RELEASE 🥳

Which issue(s) this PR fixes:

Work on #2025

Special notes for your reviewer:

Includes a few more updates to the release process to make sure everything is clearer.

[aLekSer]

Reviewed the release changes.

[agones-bot]

Build Succeeded 👏

Build Id: 49fc57b3-a526-4954-9c68-d018451eeca2

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

• image: gcr.io/agones-images/agones-controller:1.13.0-e5506c7
• image: gcr.io/agones-images/agones-sdk:1.13.0-e5506c7
• image: gcr.io/agones-images/agones-ping:1.13.0-e5506c7
• Linux C++ SDK (build): agonessdk-1.13.0-e5506c7-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.13.0-e5506c7.zip

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

• https://e5506c7-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/googleforgames/agones.git pull/2026/head:pr_2026 && git checkout pr_2026
• helm install ./install/helm/agones --namespace agones-system --name agones --set agones.image.tag=1.13.0-e5506c7

[google-oss-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: aLekSer, markmandel, roberthbailey

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• OWNERS [aLekSer,markmandel,roberthbailey]

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