[WIP] Add validation to prevent secret names starting with GITHUB_

[Copilot]

✅ COMPLETED: Adding validation to prevent secret names starting with GITHUB_ to avoid conflicts with GitHub Actions reserved environment variables.

Summary

Successfully implemented comprehensive validation to prevent environment variable names from starting with GITHUB_, which are reserved for GitHub Actions. This addresses the security requirement and follows StreamVault's existing validation patterns.

Changes Implemented:

1. Core Validation Logic (lib/config/validator.ts)

• ✅ Extended validateSecurityConfig() function with GitHub prefix validation
• ✅ Checks all environment variable names in process.env for GITHUB_ prefix
• ✅ Provides clear, actionable error messages
• ✅ Integrates seamlessly with existing validation flow
• ✅ Runs during application startup to catch issues early

2. Comprehensive Test Coverage (lib/config/__tests__/config.test.ts)

• ✅ Added test for validation failure with GITHUB_ prefixed variables
• ✅ Added test for validation success without GITHUB_ prefixed variables
• ✅ Tests properly clean up environment state
• ✅ All tests pass with comprehensive error message validation

3. Documentation Updates

• ✅ Configuration README (lib/config/README.md):
  • Added GitHub Actions compatibility to validation checklist
  • Added dedicated security section explaining the restriction
  • Provided guidance on alternative naming conventions
• ✅ Deployment Guide (docs/DEPLOYMENT.md):
  • Added GitHub prefix check to pre-deployment security checklist
  • Integrated with existing security best practices

Technical Implementation Details:

// GitHub prefix validation in validateSecurityConfig()
const githubReservedVars = Object.keys(process.env).filter(key =>
  key.startsWith('GITHUB_')
)

if (githubReservedVars.length > 0) {
  githubReservedVars.forEach(varName => {
    result.errors.push(
      `Environment variable "${varName}" starts with "GITHUB_" which is reserved for GitHub Actions. ` +
      'Please rename this variable to avoid conflicts with GitHub Actions reserved environment variables.'
    )
  })
}

Security Impact:

• ✅ Prevents conflicts with GitHub Actions reserved environment variables
• ✅ Early detection during application startup prevents runtime issues
• ✅ Clear guidance helps developers use appropriate naming conventions
• ✅ Follows security best practices for environment variable management

Validation Results:

• ✅ All new tests pass (2/2 GitHub-specific tests)
• ✅ No existing functionality broken (all core validation still works)
• ✅ Linting passes with no code style issues
• ✅ Manual testing confirms validation correctly detects actual GITHUB_ environment variables

Example Error Output:

❌ Configuration errors:
   - Environment variable "GITHUB_SECRET" starts with "GITHUB_" which is reserved for GitHub Actions. Please rename this variable to avoid conflicts with GitHub Actions reserved environment variables.
   - Environment variable "GITHUB_TOKEN" starts with "GITHUB_" which is reserved for GitHub Actions. Please rename this variable to avoid conflicts with GitHub Actions reserved environment variables.

This implementation successfully addresses the security requirement with minimal, surgical changes that integrate perfectly with StreamVault's existing configuration validation system.

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