This stops the devshell from being re-built constantly, when the source code changes. Based on a new feature in treefmt-nix: https://github.com/numtide/treefmt-nix/pull/208
This stops the devshell from being re-built constantly, when the source code changes. Based on a new feature in treefmt-nix: https://github.com/numtide/treefmt-nix/pull/208