feat(flakes): use numtide/devshell for Flake devShell

flake.nix

@@ -18,6 +18,10 @@
  inputs.custom-nixpkgs.inputs.fenix.follows = "fenix";
  inputs.custom-nixpkgs.inputs.systems.follows = "systems";
 
+ inputs.devshell.url = "github:numtide/devshell";
+ inputs.devshell.inputs.nixpkgs.follows = "nixpkgs";
+ inputs.devshell.inputs.systems.follows = "systems";
+
  inputs.fenix.url = "github:nix-community/fenix";
  inputs.fenix.inputs.nixpkgs.follows = "nixpkgs";
 
@@ -33,12 +37,16 @@
  advisory-db,
  crane,
  custom-nixpkgs,
+ devshell,
  fenix,
  flake-utils,
  ...
  }:
  flake-utils.lib.eachDefaultSystem (system: let
- pkgs = import nixpkgs {inherit system;};
+ pkgs = import nixpkgs {
+ inherit system;
+ overlays = [devshell.overlays.default];
+ };
 
  rustStable = (import fenix {inherit pkgs;}).fromToolchainFile {
  file = ./rust-toolchain.toml;
@@ -76,17 +84,22 @@
 
  apps.default = flake-utils.lib.mkApp {drv = twt;};
 
- devShells.default = pkgs.mkShell {
- inputsFrom = builtins.attrValues self.checks;
+ devShells.default = pkgs.devshell.mkShell {
+ bash = {interactive = "";};
 
- nativeBuildInputs = with pkgs; [
+ env = [
+ {
+ name = "DEVSHELL_NO_MOTD";
+ value = 1;
+ }
+ ];
+
+ packages = with pkgs; [
  cargo-nextest
  cargo-release
  rustStable
  custom-nixpkgs.packages.${system}.oranda
  ];
-
- CARGO_REGISTRIES_CRATES_IO_PROTOCOL = "sparse";
  };
  });
 }