feat(nodegroup): new integration: spot ocean

[IdanShohamNetApp]

Description

Similarly to the existing integration with kops instance groups, this PR seamlessly integrates Ocean by Spot with unmanaged nodegroups, as a drop-in replacement for AWS Auto Scaling groups.

Usage

To create a new Ocean nodegroup, run:

eksctl create nodegroup \
  --cluster <cluster-name> \
  --nodegroup-name <nodegroup-name> \
  --spot-ocean

To create multiple nodegroups and have more control over the configuration, a config file can be used:

cluster.yaml

• A cluster with an unmanaged nodegroup and an Ocean-managed nodegroup.

---

apiVersion: eksctl.io/v1alpha5
kind: ClusterConfig
metadata:
  name: example
  region: us-west-2
nodeGroups:

### Use Ocean.
- name: ocean-ng-1
  minSize: 2
  maxSize: 4

  Enable Ocean integration with all defaults.
  Please see the documentation for a list of available options.
  spotOcean: {} 

Use AWS Auto Scaling group.

- name: ng-2
  minSize: 2
  maxSize: 3

Documentation

Full documentations, with usage examples, can be found here.

[oded7hoffman]

Link to the issue page:
#6694 (comment)

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