Expose webhook affinity via values.yaml

[shearn89]

Description of the change

Expose affinity via values.yaml for the Webhook

Existing or Associated Issue(s)

Supports #814

Additional Information

I have the policy controller webhook deployed to my cluster, and have noticed that both replicas are on the same node. This is due to the preferredDuring... setting in the default affinity. I would also like to prefer different AZs, and require different nodes. To do this the user must be able to configure the affinity settings manually.

Checklist

• Chart version bumped in Chart.yaml according to semver. Where applicable, update and bump the versions in any associated umbrella chart
• Variables are documented in the values.yaml and added to the README.md. The helm-docs utility can be used to generate the necessary content. Use helm-docs --dry-run to preview the content.
• JSON Schema generated.
• List tests pass for Chart using the Chart Testing tool and the ct lint command.

[shearn89]

Tested locally with helm template - correctly reads the default if values.yaml/affinity is {}, and overrides otherwise.

[shearn89]

Also if instructions could be added to the CONTRIBUTING.md that explain how to generate the schema, that would be ideal.

NVM, remembered.