feat: initial `nix` setup using `cargo2nix` (#599)
Co-authored-by: Ag <aravindmallapureddy@juspay.in>
Co-authored-by: Sanchith Hegde <22217505+SanchithHegde@users.noreply.github.com>
Co-authored-by: Sanchith Hegde <sanchith.hegde@juspay.in>
Co-authored-by: Arun Raj M <jarnura47@gmail.com>
