Adding sed compatibility for MacOS (#520)

Author: Maleware

template/default.nix

@@ -114,6 +114,10 @@ rec {
  # (see https://github.com/pre-commit/pre-commit-hooks?tab=readme-ov-file#trailing-whitespace).
  # So, remove the trailing newline already here to avoid that an
  # unnecessary change is shown in Git.
- sed -i '$d' Cargo.nix
+ if [[ "$(uname)" == "Darwin" ]]; then
+ sed -i \"\" '$d' Cargo.nix
+ else
+ sed -i '$d' Cargo.nix
+ fi
  '';
 }