add devshell cli

devshell.nix

@@ -0,0 +1,50 @@
+{ pkgs, ... }:
+(pkgs.devshell.mkShell {
+  name = "dadada/nix-config";
+
+  packages = with pkgs; [
+    agenix
+    nixpkgs-fmt
+    nixos-rebuild
+  ];
+
+  commands = [
+    {
+      name = "switch";
+      help = "Switch the configuration on the current system.";
+      command = ''
+        flake=$(nix flake metadata --json ${./.} | jq -r .url)
+        ${pkgs.nixos-rebuild}/bin/nixos-rebuild switch --flake ".#" --use-remote-sudo
+      '';
+      category = "deploy";
+    }
+    {
+      name = "format";
+      help = "Format the project";
+      command = ''
+        nixpkgs-fmt .
+      '';
+      category = "dev";
+    }
+    {
+      name = "update";
+      help = "Update the project";
+      command = ''
+        nix flake update --commit-lock-file
+      '';
+      category = "dev";
+    }
+    {
+      name = "deploy";
+      help = "Deploy this flake";
+      package = "deploy-rs";
+      category = "deploy";
+    }
+    {
+      name = "check";
+      help = "Run checks";
+      category = "dev";
+      command = "nix flake check";
+    }
+  ];
+})