feat: environment variable to toggle signups

[notnavindu]

closes #732

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[github-actions]

Thank you for following the naming conventions for pull request titles! 💚🚀

[catalinpit]

Thanks for the PR! Looks good. I tested it locally and it works fine.

[Mythie]

LGTM! Thanks not Navindu 😄

[notnavindu]

My pleasure!