Install docs: Supported Container Architectures

[markmandel]

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

What this PR does / Why we need it:

Added a section in the installation docs where we specify the supported cluster requirements. Now we're supporting multiple OS's and architectures at different levels, I've added a table to indicate each of the levels, so that users are aware.

Which issue(s) this PR fixes:

Work on #2216

Special notes for your reviewer:

I didn't keep arm64 for the past release, since we know the controller is broken for 1.23.0.

As part of this work, I moved the note on node pools into its own "best practices" section.

[markmandel]

Screenshot of changes.

[agones-bot]

Build Succeeded 👏

Build Id: e3dbc32c-721e-412c-a9e0-96902c3f2d9b

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

• image: gcr.io/agones-images/agones-controller:1.24.0-5c75c11-amd64
• image: gcr.io/agones-images/agones-controller:1.24.0-5c75c11-arm64
• image: gcr.io/agones-images/agones-ping:1.24.0-5c75c11-amd64
• image: gcr.io/agones-images/agones-ping:1.24.0-5c75c11-arm64
• Linux C++ SDK (build): agonessdk-1.24.0-5c75c11-arm64-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.24.0-5c75c11-arm64.zip

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

• https://5c75c11-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/googleforgames/agones.git pull/2621/head:pr_2621 && git checkout pr_2621
• helm install agones ./install/helm/agones --namespace agones-system --set agones.image.tag=1.24.0-5c75c11-amd64

[google-oss-prow]

[APPROVALNOTIFIER] This PR is APPROVED

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

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [markmandel,roberthbailey]

Approvers can indicate their approval by writing /approve in a comment
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[agones-bot]

Build Succeeded 👏

Build Id: 9aed3f1a-5d29-4245-a617-f0cecf8d2fc9

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

• image: gcr.io/agones-images/agones-controller:1.24.0-24d30ca-amd64
• image: gcr.io/agones-images/agones-controller:1.24.0-24d30ca-arm64
• image: gcr.io/agones-images/agones-ping:1.24.0-24d30ca-amd64
• image: gcr.io/agones-images/agones-ping:1.24.0-24d30ca-arm64
• Linux C++ SDK (build): agonessdk-1.24.0-24d30ca-arm64-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.24.0-24d30ca-arm64.zip

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

• https://24d30ca-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/googleforgames/agones.git pull/2621/head:pr_2621 && git checkout pr_2621
• helm install agones ./install/helm/agones --namespace agones-system --set agones.image.tag=1.24.0-24d30ca-amd64