chore: add workflow to purge deployments safely

[Copilot]

This PR adds a GitHub Actions workflow and bash script to safely purge all deployments in the repository without deleting environments. The implementation provides a safe, manual process for cleaning up deployment history while preserving environment configurations.

What's Added

🔧 Bash Script (scripts/purge_deployments.sh)

• Lists all deployments using GitHub REST API with pagination support (100 per page)
• Marks each deployment as inactive before deletion (safe precondition)
• Deletes deployments one by one
• Provides detailed summary showing count per environment and total deleted
• Uses only curl + jq (no gh CLI dependency)
• Works with default GITHUB_TOKEN
• Includes automatic jq installation for Ubuntu runners

⚡ GitHub Actions Workflow (.github/workflows/purge-deployments.yml)

• Manual trigger only via workflow_dispatch
• Safety confirmation required: User must type I UNDERSTAND to proceed
• Proper permissions: contents: read, deployments: write
• Concurrency control: Prevents multiple simultaneous runs
• Conditional execution: Only runs when confirmation string matches exactly

Usage Instructions

1. Navigate to Actions → Purge Deployments
2. Click Run workflow
3. Enter I UNDERSTAND in the confirmation field
4. Click Run workflow to execute

The workflow will:

• List all existing deployments
• Mark each as inactive
• Delete each deployment
• Print a summary like:

  Deleted deployments summary:
    production: 5
    staging: 12
    development: 8
  Total: 25
  

Safety Features

• ✅ Environments are preserved - only deployments are removed
• ✅ Manual confirmation required - prevents accidental execution
• ✅ Graceful error handling - continues on individual failures
• ✅ Detailed logging - shows exactly what was processed
• ✅ No external dependencies - uses standard GitHub token

This tooling helps maintain a clean deployment history while keeping all environment configurations intact.

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💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.

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