Allow array values for extra

[dmarcs]

Chart version:
7.15.10

Kubernetes version:
v1.21.5

Kubernetes provider: E.g. GKE (Google Kubernetes Engine)
Docker for Mac

Helm Version:
v3.3.4

helm get release output

e.g. helm get elasticsearch (replace elasticsearch with the name of your helm release)

Be careful to obfuscate every secrets (credentials, token, public IP, ...) that could be visible in the output before copy-pasting.

If you find some secrets in plain text in helm get release output you should use Kubernetes Secrets to managed them is a secure way (see Security Example).

Output of helm get release

Describe the bug:
According to https://github.com/elastic/helm-charts/blob/main/logstash/values.yaml this should work

extraVolumes:
  - name: extras
     emptyDir: {}

extraVolumeMounts:
  - name: extras
     mountPath: /usr/share/extras
     readOnly: true

but I get this error when I run helm install

Error: template: charts/logstash/templates/statefulset.yaml:143:14: executing "charts/logstash/templates/statefulset.yaml" at <.Values.extraVolumes>: wrong type for value; expected string; got []interface {}

Steps to reproduce:

1. Set extraVolumes and extraVolumeMounts

extraVolumes:
  - name: extras
     emptyDir: {}

extraVolumeMounts:
  - name: extras
     mountPath: /usr/share/extras
     readOnly: true

2. helm install logstash

Expected behavior:
Volume should be created, but instead there's an error message

Provide logs and/or server output (if relevant):

Be careful to obfuscate every secrets (credentials, token, public IP, ...) that could be visible in the output before copy-pasting

Any additional context:
Issue is fixed with with #1450