Add Nix flake support for reproducible archiving

.github/workflows/nix.yml

@@ -0,0 +1,34 @@
+name: Nix Build and Check
+
+on:
+  push:
+    branches: [ main, v4-main ]
+  pull_request:
+    branches: [ main, v4-main ]
+
+jobs:
+  nix-build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install Nix
+        uses: cachix/install-nix-action@v27
+        with:
+          extra_nix_config: |
+            experimental-features = nix-command flakes
+
+      - name: Check flake
+        run: nix flake check
+
+      - name: Build package
+        run: nix build
+
+      - name: Test wikiteam3dumpgenerator
+        run: |
+          nix run . -- --help
+
+      - name: Verify reproducibility
+        run: |
+          nix build --rebuild
+          nix path-info --json | jq -r '.[].narHash'

flake.nix

@@ -0,0 +1,56 @@
+{
+  description = "wikiteam3 - Nix flake for reproducible wiki archiving";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+  };
+
+  outputs = { self, nixpkgs }:
+    let
+      system = "x86_64-linux";
+      pkgs = nixpkgs.legacyPackages.${system};
+
+      wikiteam3 = pkgs.python3Packages.buildPythonApplication {
+        pname = "wikiteam3";
+        version = "3.11.0";
+
+        pyproject = true;
+
+        src = ./.;
+
+        build-system = with pkgs.python3Packages; [
+          setuptools
+        ];
+
+        propagatedBuildInputs = with pkgs.python3Packages; [
+          requests
+          mwclient
+          mwparserfromhell
+          file-read-backwards
+          python-slugify
+        ];
+
+        meta = with pkgs.lib; {
+          description = "Tools for archiving wikis";
+          homepage = "https://github.com/saveweb/wikiteam3";
+          license = licenses.gpl3;
+          maintainers = [ "Meta-Introspector Research Group" ];
+        };
+      };
+
+    in {
+      packages.${system} = {
+        default = wikiteam3;
+        wikiteam3 = wikiteam3;
+      };
+
+      apps.${system}.default = {
+        type = "app";
+        program = "${wikiteam3}/bin/wikiteam3dumpgenerator";
+      };
+
+      devShells.${system}.default = pkgs.mkShell {
+        buildInputs = [ wikiteam3 ];
+      };
+    };
+}