Write Terraform scripts and docs to show how to create OKE cluster and install Agones

[ouxingning]

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:
Besides AWS, GCP and Azure, OCI (Oracle Cloud Infrastructure) is another public cloud, OCI Kubernetes Engine (OKE) is one of its providing service, so I wrote Terraform scripts and documents to demonstrate how to create OKE cluster and install Angones, I hope contributing these Terraform scripts and documents, so I created this pull request.

Which issue(s) this PR fixes:

Closes #

Special notes for your reviewer:
My friend, thank you so much for your review.

[agones-bot]

Build Succeeded 🥳

Build Id: 86bc9598-9e5a-48b0-8fa1-ff621623c490

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:1.45.0-dev-2a900c3
• image: us-docker.pkg.dev/agones-images/ci/agones-extensions:1.45.0-dev-2a900c3
• image: us-docker.pkg.dev/agones-images/ci/agones-sdk:1.45.0-dev-2a900c3-linux
• image: us-docker.pkg.dev/agones-images/ci/agones-ping:1.45.0-dev-2a900c3
• image: us-docker.pkg.dev/agones-images/ci/agones-allocator:1.45.0-dev-2a900c3
• Linux C++ SDK (build): agonessdk-1.45.0-dev-2a900c3-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.45.0-dev-2a900c3.zip

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

• https://2a900c3-dot-preview-dot-agones-images.appspot.com/

To install this version:

git fetch https://github.com/googleforgames/agones.git pull/4023/head:pr_4023 && git checkout pr_4023
helm install agones ./install/helm/agones --namespace agones-system --set agones.image.registry=us-docker.pkg.dev/agones-images/ci --set agones.image.tag=1.45.0-dev-2a900c3

[markmandel]

Looks pretty good! Just a few tweaks!

[ouxingning]

@markmandel Hi Mark, thanks for your review, I have fixed the above issues.

[agones-bot]

Build Succeeded 🥳

Build Id: ad62dc15-36c2-497d-9c3e-47f4dc2c0130

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:1.45.0-dev-79cfec3
• image: us-docker.pkg.dev/agones-images/ci/agones-extensions:1.45.0-dev-79cfec3
• image: us-docker.pkg.dev/agones-images/ci/agones-sdk:1.45.0-dev-79cfec3-linux
• image: us-docker.pkg.dev/agones-images/ci/agones-ping:1.45.0-dev-79cfec3
• image: us-docker.pkg.dev/agones-images/ci/agones-allocator:1.45.0-dev-79cfec3
• Linux C++ SDK (build): agonessdk-1.45.0-dev-79cfec3-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.45.0-dev-79cfec3.zip

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

• https://79cfec3-dot-preview-dot-agones-images.appspot.com/

To install this version:

git fetch https://github.com/googleforgames/agones.git pull/4023/head:pr_4023 && git checkout pr_4023
helm install agones ./install/helm/agones --namespace agones-system --set agones.image.registry=us-docker.pkg.dev/agones-images/ci --set agones.image.tag=1.45.0-dev-79cfec3

[markmandel]

Thanks for the ping - updating and taking another look.

[agones-bot]

Build Succeeded 🥳

Build Id: 9208a1f6-b842-42d9-ab23-3628c6a76545

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:1.45.0-dev-ed0a946
• image: us-docker.pkg.dev/agones-images/ci/agones-extensions:1.45.0-dev-ed0a946
• image: us-docker.pkg.dev/agones-images/ci/agones-sdk:1.45.0-dev-ed0a946-linux
• image: us-docker.pkg.dev/agones-images/ci/agones-ping:1.45.0-dev-ed0a946
• image: us-docker.pkg.dev/agones-images/ci/agones-allocator:1.45.0-dev-ed0a946
• Linux C++ SDK (build): agonessdk-1.45.0-dev-ed0a946-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.45.0-dev-ed0a946.zip

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

• https://ed0a946-dot-preview-dot-agones-images.appspot.com/

To install this version:

git fetch https://github.com/googleforgames/agones.git pull/4023/head:pr_4023 && git checkout pr_4023
helm install agones ./install/helm/agones --namespace agones-system --set agones.image.registry=us-docker.pkg.dev/agones-images/ci --set agones.image.tag=1.45.0-dev-ed0a946