fix: add empty dir for /.ratify to allow nonroot directory permission

[fseldow]

Description

Which issue(s) does this PR resolve?

Fixes #

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Helm chart change (any edit/addition/update that is necessary for changes merged to the main branch)
• This change requires a documentation update

Testing and verification

Checklist

• Does the affected code have corresponding tests?
• Are the changes documented, not just with inline documentation, but also with conceptual documentation such as an overview of a new feature, or task-based documentation like a tutorial? Consider if this change should be announced on your project blog.
• Does this introduce breaking changes that would require an announcement or bumping the major version?
• Do all new files have appropriate license header?

Post merge requirements

• MAINTAINERS: manually trigger the "Publish Package" workflow after merging any PR that indicates Helm Chart Change

[Copilot]

Pull request overview

Updates the Ratify Gatekeeper Provider Helm chart to support running with a read-only root filesystem / non-root user by ensuring a writable /.ratify directory is available via a pod volume.

Changes:

• Mount a new emptyDir volume at /.ratify in the Gatekeeper Provider Deployment.
• Bump the Helm chart version and appVersion to 2.0.1-dev.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
deployments/ratify-gatekeeper-provider/templates/deployment.yaml	Adds an emptyDir volume and mounts it at /.ratify to provide a writable directory.
deployments/ratify-gatekeeper-provider/Chart.yaml	Bumps chart metadata version fields.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.10%. Comparing base (dec8a6e) to head (9cc40bd).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2514      +/-   ##
==========================================
- Coverage   77.15%   77.10%   -0.05%     
==========================================
  Files         105      105              
  Lines        4657     4657              
==========================================
- Hits         3593     3591       -2     
- Misses        916      917       +1     
- Partials      148      149       +1     

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