feature: Add env variable to allow for setting custom output filename

[zkoppert]

contributors.md may overwrite an existing file so having an option would be a good idea.

[github-actions]

This issue is stale because it has been open 21 days with no activity. Remove stale label or comment or this will be closed in 14 days.

[ayushjariyal]

@zkoppert, I want to work on this issue. May I proceed?

[zkoppert]

@ayushjariyal Sounds great! Thank you!