Verify GitHub workflow permissions compliance for OpenSSF Scorecard requirements

[Copilot]

Summary

This PR addresses the Token-Permissions check from the OpenSSF Scorecard recommendations by verifying that all GitHub workflow files have proper minimum token permissions defined.

Analysis Results

After comprehensive analysis of all 52 GitHub workflow files in .github/workflows/, I found that the repository is already fully compliant with the OpenSSF Scorecard Token-Permissions requirements.

Current Compliance Status ✅

All workflow files properly implement the security best practices:

• Root-level permissions: Every workflow has a permissions: block at the root level
• Minimum permissions: Most workflows use permissions: contents: read (recommended minimum)
• Alternative format: Some workflows use permissions: read-all (acceptable alternative)
• Job-level permissions: Jobs requiring additional permissions have appropriate job-level permissions defined
• Proper positioning: All permissions blocks are correctly placed after the on: block

Examples of Proper Implementation

Standard format (most workflows):

name: Build
on:
  push:
    branches: [main]
permissions:
  contents: read

Alternative format (some workflows):

name: OSSF Scorecard
on:
  push:
    branches: [main]
permissions: read-all

Job-level permissions (when needed):

jobs:
  analysis:
    runs-on: ubuntu-latest
    permissions:
      security-events: write  # required for Code scanning upload
      id-token: write         # required for GitHub OIDC token

Verification Script

Created a comprehensive verification script (verify_all_workflow_permissions.py) that:

• Scans all workflow files recursively
• Validates root-level permissions compliance
• Analyzes job-level permissions
• Provides detailed reporting with error/warning classification

The script confirmed 52/52 workflows passed validation.

Impact

• ✅ OpenSSF Scorecard Token-Permissions check should pass
• ✅ Repository maintains security best practices
• ✅ No functional changes required - all workflows already compliant
• ✅ Future workflow additions can be validated using the provided script

Fixes #32.

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