Build snow Admin AMI as part of the release process

[jiayiwang7]

When the EKS-A release pipeline finishes running and release manifest file is generated, we should trigger a separate snow admin AMI pipeline that automatically builds the admin AMI and publishes a message containing the raw admin AMI s3 URL to a SNS topic that Snow team can subscribe to.

Example message body (JSON):

{
    "releaseVersion": "v0.10.1",
    "snowAdminAMI": {
        "ubuntu": {
            "uri": "https://eksa-snow-amis.s3.us-west-2.amazonaws.com/projects/aws/eks-a-admin-image/latest/snow-admin.raw",
            "os": "linux",
            "osName": "ubuntu",
            "sha256": "a53760413d5836eeb1fb0d7ae6f1623e6a8712d7f82ada7ab78a3e6b9c4b0cb8",
            "sha512": "93569c27eba92e03405b3304b9c068fa5fbd59f59dd0ed8223e082206659ce244e60399136403b0d1fd3c7d742bae87186d5cff12bf8a4a3be9907f617977e34",
        }
    },
    "snowNodeAMIs": [
        {
            "kubeChannel": "1.20",
            "kubeVersion": "v1.20.15-eks-1-20-14"
            "eksdReleaseName": "kubernetes-1-20-eks-14",
            "ubuntu": {
                "uri": "https://eksa-snow-amis.s3.us-west-2.amazonaws.com/projects/aws/eks-a-node-image/latest/snow-node-1.20.raw",
                "os": "linux",
                "osName": "ubuntu",
                "sha256": "a53760413d5836eeb1fb0d7ae6f1623e6a8712d7f82ada7ab78a3e6b9c4b0cb8",
                "sha512": "93569c27eba92e03405b3304b9c068fa5fbd59f59dd0ed8223e082206659ce244e60399136403b0d1fd3c7d742bae87186d5cff12bf8a4a3be9907f617977e34",
            }
        },
        {
            "kubeChannel": "1.21",
            "kubeVersion": "v1.21.9-eks-1-21-12"
            "eksdReleaseName": "kubernetes-1-21-eks-12",
            "ubuntu": {
                "uri": "https://eksa-snow-amis.s3.us-west-2.amazonaws.com/projects/aws/eks-a-node-image/latest/snow-node-1.21.raw",
                "os": "linux",
                "osName": "ubuntu",
                "sha256": "a53760413d5836eeb1fb0d7ae6f1623e6a8712d7f82ada7ab78a3e6b9c4b0cb8",
                "sha512": "93569c27eba92e03405b3304b9c068fa5fbd59f59dd0ed8223e082206659ce244e60399136403b0d1fd3c7d742bae87186d5cff12bf8a4a3be9907f617977e34",
            }
        },
        {
            "kubeChannel": "1.22",
            "kubeVersion": "v1.22.6-eks-1-22-10"
            "eksdReleaseName": "kubernetes-1-22-eks-10",
            "ubuntu": {
                "uri": "https://eksa-snow-amis.s3.us-west-2.amazonaws.com/projects/aws/eks-a-node-image/latest/snow-node-1.22.raw",
                "os": "linux",
                "osName": "ubuntu",
                "sha256": "a53760413d5836eeb1fb0d7ae6f1623e6a8712d7f82ada7ab78a3e6b9c4b0cb8",
                "sha512": "93569c27eba92e03405b3304b9c068fa5fbd59f59dd0ed8223e082206659ce244e60399136403b0d1fd3c7d742bae87186d5cff12bf8a4a3be9907f617977e34",
            }
        },
        {
            "kubeChannel": "1.23",
            "kubeVersion": "v1.23.7-eks-1-23-5"
            "eksdReleaseName": "kubernetes-1-23-eks-5",
            "ubuntu": {
                "uri": "https://eksa-snow-amis.s3.us-west-2.amazonaws.com/projects/aws/eks-a-node-image/latest/snow-node-1.23.raw",
                "os": "linux",
                "osName": "ubuntu",
                "sha256": "a53760413d5836eeb1fb0d7ae6f1623e6a8712d7f82ada7ab78a3e6b9c4b0cb8",
                "sha512": "93569c27eba92e03405b3304b9c068fa5fbd59f59dd0ed8223e082206659ce244e60399136403b0d1fd3c7d742bae87186d5cff12bf8a4a3be9907f617977e34",
            }
        }
    ]
}

• releaseVersion: the EKS-A prod release version (we publish a message for any EKS-A major, minor or patch release)
• snowNodeAMIs: contains a list of node AMI meta data for each supported K8s version in the release

Build admin image:

• Install eks-a deps (docker)
• Copy eks-a and eksctl to bin directory
• Use the CLI to import all images and store them locally
• Use the CLI to import/download all necessary artifacts for the CLI operation

Release steps: S3 bucket notifications -> event trigger -> S3 replication, snow admin AMI build

Make sure we update the release runbook so that the release manager can validate the snow build as part of the release process.