Configure sane cache and request size defaults

What does this MR do?

Configure sane cache and request size defaults

Ports parts of our runway/prod config to our chart to improve memory usage.

Related MR: https://gitlab.com/gitlab-org/govern/secrets-management/gitlab-secrets-manager-container/-/merge_requests/50

Relates #28 (closed)

Author's Checklist

For anything in this list which will not be completed, please provide a reason in the MR discussion.

Required

• Ensure a release milestone is set.
• MR title and description are up to date, accurate, and descriptive.
• MR targeting the appropriate branch.
• MR has a green pipeline on GitLab.com.
• When ready for review, MR is labeled workflowready for review per the MR workflow.

Expected

• Test plan indicating conditions for success has been posted and passes.
• Documentation is created or updated.
  • New options will be added to docs when we bump the OpenBao chart version in GitLab chart.
• Tests are added.

Related issues

Closes #28 (closed)