chore: fix nix flake (#3259)

Author: meenzen

.gitignore

@@ -3,7 +3,7 @@
 .DS_Store
 .python-version
 .idea/
-flake.lock
+.direnv/
 
 # ignore roles pulled by ansible-galaxy
 /roles/galaxy/*

flake.lock

@@ -1,19 +1,30 @@
 {
-  inputs.nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
-
-  outputs = { self, nixpkgs, ... }:
-    let
-      pkgs = import nixpkgs { system = "x86_64-linux"; };
-    in
-    {
-      devShell.x86_64-linux = pkgs.mkShell {
-        buildInputs = with pkgs; [
-          just
-          python311Packages.ansible-core
-          python311Packages.passlib
-        ];
-        LC_ALL = "C.UTF-8";
-        LC_CTYPE = "C.UTF-8";
-      };
-    };
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+  outputs = {
+    self,
+    nixpkgs,
+    flake-utils,
+  }:
+    flake-utils.lib.eachDefaultSystem
+    (
+      system: let
+        pkgs = import nixpkgs {
+          inherit system;
+        };
+      in
+        with pkgs; {
+          devShells.default = mkShell {
+            buildInputs = [
+              just
+              ansible
+            ];
+            shellHook = ''
+              echo "$(ansible --version)"
+            '';
+          };
+        }
+    );
 }