add flake dev shell

flake.lock

@@ -2,11 +2,11 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1756886854,
-        "narHash": "sha256-6tooT142NLcFjt24Gi4B0G1pgWLvfw7y93sYEfSHlLI=",
+        "lastModified": 1758070117,
+        "narHash": "sha256-uLwwHFCZnT1c3N3biVe/0hCkag2GSrf9+M56+Okf+WY=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "0e6684e6c5755325f801bda1751a8a4038145d7d",
+        "rev": "e9b7f2ff62b35f711568b1f0866243c7c302028d",
         "type": "github"
       },
       "original": {

flake.nix

@@ -3,17 +3,18 @@
 
   inputs.nixpkgs.url = "nixpkgs/nixos-25.05";
 
-  outputs = { self, nixpkgs, ... }@inputs:
+  outputs =
+    { self, nixpkgs, ... }@inputs:
     let
       pkgs = nixpkgs.legacyPackages.x86_64-linux;
-    start =
-      pkgs.writeShellScriptBin "start" ''
+      start = pkgs.writeShellScriptBin "start" ''
                 set -e
         	export NIXPKGS_ALLOW_INSECURE=1
                 export QEMU_NET_OPTS="hostfwd=tcp::8080-:80"
                 ${pkgs.nixos-shell}/bin/nixos-shell --flake .
       '';
-  in {
+    in
+    {
       nixosConfigurations.vm = nixpkgs.lib.nixosSystem {
         system = "x86_64-linux";
         specialArgs.inputs = inputs;
@@ -30,20 +31,25 @@
               });
 
               pythonPackagesExtensions = super.pythonPackagesExtensions ++ [
-    (
-       python-final: python-prev: {
-         moto = python-prev.moto.overridePythonAttrs (oldAttrs: { doCheck = false; });
-       }
-    )
+                (python-final: python-prev: {
+                  moto = python-prev.moto.overridePythonAttrs (oldAttrs: {
+                    doCheck = false;
+                  });
+                })
               ];
 
-
-
             })
           ];
         };
         modules = [
-        ({ lib, config, pkgs, ... }: {
+          (
+            {
+              lib,
+              config,
+              pkgs,
+              ...
+            }:
+            {
 
               virtualisation = {
                 memorySize = 8000;
@@ -73,13 +79,21 @@
 
               system.stateVersion = "25.05";
               services.getty.autologinUser = "root";
-        })
+            }
+          )
         ];
       };
 
+      devShells.x86_64-linux.default = pkgs.mkShell {
+        packages = [pkgs.python3Packages.mastodon-py ] ++ pkgs.froide-govplan.dependencies;
+        shellHook = ''
+          export GDAL_LIBRARY_PATH="${pkgs.gdal}/lib/libgdal.so"
+          export GEOS_LIBRARY_PATH="${pkgs.geos}/lib/libgeos_c.so"
+        '';
+      };
+
       packages = { inherit start; };
       defaultPackage.x86_64-linux = start;
 
     };
 }
-