Describe the bug
When I set the readOnlyRootFilesystem key to 'true', the OpenSearch Dashboards pod cannot be started. The following messages appear in the pod log:

FATAL Error: Unable to write OpenSearch Dashboards UUID file, please check the uuid.server configuration value in opensearch_dashboards.yml and ensure OpenSearch Dashboards has sufficient permissions to read / write to this file. Error was: EROFS

In addition, I can find no example or documentation showing the configuration variable (uuid.server) mentioned in the error message.

To Reproduce
Steps to reproduce the behavior:

1. I added the following stanza to my user-values.yaml file:

securityContext:
  readOnlyRootFilesystem: true

2. Deploy OpenSearch Dashboards using Helm (and pointing to the user-values.yaml file)
3. I can see the OpenSearch Dashboards pod starting up but fails fairly early with the error messages shown above.
4. If I remove that stanza, OpenSearch Dashboards comes up without problems.

Expected behavior
I expected OpenSearch Dashboards to come up without problems. I would also expect to find some mention of the configuration variable (uuid.server) in the documentation or sample opensearch-dashboards.yml files.

Chart Name
I've seen this error with using both OpenSearch Dashboards version 1.3.5 (Helm chart version 1.5.1) and 2.4.1 (Helm chart version 2.7.0).

Host/Environment (please complete the following information):

• Helm Version: 3.7.0
• Kubernetes Version: 1.22.3

Additional context

• I notice that readOnlyRootFilesystem key is included (on line 95) in the Helm charts values.yml file but commented out.
• I also noticed is that if I omit the readOnlyRootFilesystem key (which allows OpenSearch Dashboards to come up), and SSH onto the running OpenSearch Dashboard pod, the file /usr/share/opensearch-dashboards/data/uuid and owned by user "opensearch-dashboards" (UID:1000) rather than root.