Support karpenter-crd Helm Chart and Fix Node Interruption Handling

[milldr]

what

• Support deploying the karpenter-crd helm chart alongside the karpenter chart with the eks/karpenter component
• Bring back documentation for the Node Interruption Handler with Karpenter
• Replace iam_policy_statements with iam_policy

why

• karpenter-crd can be installed alongside the karpenter helm chart to automatically manage the lifecycle of Karpenter CRDs.
• Node Interruption Handling with eks/karpenter was added with Karpenter Node Interruption Handler #713, but documentation was unintentionally removed with Enable terraform plan access via dynamic Terraform roles #715
• On initial creation, the helm-release resource will not know the result of the SQS queue resource, and the plan will fail with the following issue. iam_policy solves this issue and is the updated pattern

│ The "count" value depends on resource attributes that cannot be determined until apply, so Terraform cannot predict how many instances will be created. To work around this, use the
│ -target argument to first apply only the resources that the count depends on.

references

• Karpenter Upgrade guide, reference for karpenter-crd: https://karpenter.sh/v0.31/upgrade-guide/#custom-resource-definition-crd-upgrades

[aknysh]

LGTM, a few nitpicks

[Nuru]

See comments. Significant changes need to be made to prevent the Kubernetes namespace from being destroyed on configuration changes, and documentation needs to explain how the upgrade path.

[Nuru]

Are you sure you don't have to import the CRD helm chart?