fix: Require CLI configuration file to have 0600 permissions

Description

This adds 600 permission protection to the GitLab config file.

Resolves #7494 (closed), for real this time

How has this been tested?

Screenshots (if appropriate):

Types of changes

  • 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 change)
  • Documentation
  • Chore (Related to CI or Packaging to platforms)
  • Test gap

Closes #7494 (closed)

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