Add flake.nix to project

flake.nix

@@ -0,0 +1,44 @@
+{
+  # inputs.nixpkgs.url = "nixpkgs/nixos-22.11";
+  inputs.nixpkgs.url = "nixpkgs/nixos-unstable";
+
+  outputs = { self, nixpkgs }: let
+    system = "x86_64-linux";
+    pkgs = nixpkgs.legacyPackages.${system};
+    inherit (pkgs) lib;
+  in {
+    apps.${system} = let
+      app = program: {
+        type = "app";
+        inherit program;
+      };
+    in {
+      default = self.apps.${system}.dev;
+      dev = app "${self.packages.${system}.worblehat}/bin/dev";
+      scanner = app "${self.packages.${system}.worblehat}/bin/scanner";
+    };
+
+    packages.${system} = {
+      default = self.packages.${system}.worblehat;
+      worblehat = with pkgs.python3Packages; buildPythonPackage {
+        pname = "worblehat";
+        version = "0.1.0";
+        src = ./.;
+
+        format = "pyproject";
+
+        buildInputs = [ poetry-core ];
+        propagatedBuildInputs = [
+          alembic
+          click
+          flask
+          flask-admin
+          flask-sqlalchemy
+          isbnlib
+          python-dotenv
+          sqlalchemy
+        ];
+      };
+    };
+  };
+}