add basic devshell

.envrc

@@ -0,0 +1,2 @@
+use flake
+

.gitignore

@@ -1,4 +1,5 @@
 result
+.direnv/
 .vim/undo/
 .vim/.netrwhist
 .DS_Store

flake.nix

@@ -1,7 +1,7 @@
 {
   description = "NixOS configuration with flakes";
   outputs = { self, flake-utils, home-manager, nixpkgs-nixos-unstable
-    , nixpkgs-stable, darwin, nixos-hardware, nur, agenix, neuron, sops
+    , nixpkgs-stable, darwin, nixos-hardware, nur, agenix, neuron, sops,
     }@inputs:
 
     let
@@ -49,7 +49,20 @@
             };
           };
         };
-    in {
+    in rec {
+      devShell."x86_64-linux" =
+        nixpkgs-stable.legacyPackages."x86_64-linux".mkShell {
+          buildInputs =
+            with nixpkgs-nixos-unstable.legacyPackages."x86_64-linux"; [
+              cacert
+              git
+              nixpkgs-fmt
+              openssh
+              openssl
+              pkg-config
+              statix
+            ];
+        };
       darwinConfigurations = {
         "macmini" = darwin.lib.darwinSystem {
           system = "x86_64-darwin";