Add a new prerequisite to the release checklist

[roberthbailey]

What type of PR is this?

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/kind breaking
/kind bug

/kind cleanup

/kind documentation
/kind feature
/kind hotfix

What this PR does / Why we need it:

Which issue(s) this PR fixes:

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[agones-bot]

Build Failed 😱

Build Id: c883f729-4c73-4394-aec6-0913bbf1052e

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[google-oss-prow]

[APPROVALNOTIFIER] This PR is APPROVED

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

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• OWNERS [markmandel,roberthbailey]

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[google-oss-prow]

New changes are detected. LGTM label has been removed.

[agones-bot]

Build Failed 😱

Build Id: 45b0a8fd-7b2e-4983-8369-cc62836c3b26

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[agones-bot]

Build Failed 😱

Build Id: 5cfb1e2d-cd91-4e5b-953b-bf58aa305736

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[agones-bot]

Build Failed 😱

Build Id: 8caeff4f-86e5-419a-9372-2c08531f71c1

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[roberthbailey]

e2e-feature-gates:

--- FAIL: TestAutoscalerWebhook (313.18s)
    framework.go:284: 
        	Error Trace:	framework.go:284
        	            				fleetautoscaler_test.go:479
        	Error:      	Received unexpected error:
        	            	timed out waiting for the condition
        	Test:       	TestAutoscalerWebhook
        	Messages:   	error waiting for fleet condition on fleet: simple-fleet-7276q
FAIL
time="2022-01-11 22:08:44.620" level=info msg="Namespace 1641938425 is deleted"
FAIL	agones.dev/agones/test/e2e	499.841s
FAIL

[agones-bot]

Build Failed 😱

Build Id: b39356b8-b67a-45f8-8087-01c23975b6fa

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[agones-bot]

Build Failed 😱

Build Id: 98eedcae-e1d6-42a6-8878-b00071bb4a39

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[agones-bot]

Build Succeeded 👏

Build Id: a95fcf4d-54d0-47f0-92af-9e4f58a657fc

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

• image: gcr.io/agones-images/agones-controller:1.21.0-528e4a8
• image: gcr.io/agones-images/agones-ping:1.21.0-528e4a8
• Linux C++ SDK (build): agonessdk-1.21.0-528e4a8-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.21.0-528e4a8.zip

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

• https://528e4a8-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/googleforgames/agones.git pull/2419/head:pr_2419 && git checkout pr_2419
• helm install ./install/helm/agones --namespace agones-system --name agones --set agones.image.tag=1.21.0-528e4a8