Preserve ENV vars on Rollback

[brianwarsing]

Preserve Environment Variables During Rollbacks

Changes

This PR ensures that environment variables are properly preserved when performing rollbacks in Shipit. The changes include:

• Modified trigger_revert method to accept and pass through environment variables
• Updated rollback creation to include environment variables from the original deploy
• Enhanced test coverage to verify environment variable preservation during rollbacks

Technical Details

• Added env parameter to trigger_revert method
• Ensures environment variables are passed through when:
  • Manually triggering a rollback
  • Automatically rolling back after an aborted deploy
  • Rolling back to a specific commit
• Added test cases to verify environment variable preservation in various rollback scenarios

Testing

Added comprehensive test coverage in deploys_test.rb to verify that:

• Environment variables are preserved during automatic rollbacks
• Environment variables are preserved when rolling back to a specific commit
• Environment variables are correctly passed through the rollback chain

Impact

This change ensures that rollbacks maintain the same environment configuration as the original deploy, preventing potential issues that could arise from missing or incorrect environment variables during rollback operations.