disko2: Set up dev environment for python

.envrc

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

.gitignore

@@ -1,4 +1,6 @@
 result
 
+.direnv
+
 # Created by the NixOS interactive test driver
 .nixos-test-history

.vscode/extensions.json

@@ -0,0 +1,10 @@
+{
+    "recommendations": [
+        "mkhl.direnv",
+        "jnoortheen.nix-ide",
+        "ms-python.python",
+        "ms-python.debugpy",
+        "ms-python.black-formatter",
+        "ms-python.isort"
+    ]
+}

flake.nix

@@ -72,6 +72,22 @@
           inherit (self.packages.${system}) disko-doc;
         });
 
+      devShells = forAllSystems (system:
+        let
+          pkgs = nixpkgs.legacyPackages.${system};
+        in
+        {
+          default = pkgs.mkShell {
+            name = "disko-dev";
+            packages = with pkgs; [
+              (python3.withPackages (ps: [
+                ps.black # Code formatter
+                ps.isort # Import sorter
+              ]))
+            ];
+          };
+        });
+
       nixosConfigurations.testmachine = lib.nixosSystem {
         system = "x86_64-linux";
         modules = [