Fix compgen not found error

Fix the `compgen not found` error when running `run help`, or `run` with
no arguments within a direnv shell.

build.yaml

@@ -5,6 +5,7 @@ language: php
 flake:
   devshell:
     packages:
+      - bashInteractive
       - nodePackages.pnpm
       - nodejs
       - php82

flake.nix

@@ -12,7 +12,7 @@
       inherit (pkgs) mkShell;
     in {
       devShells.${system}.default =
-        mkShell { buildInputs = with pkgs; [ nodePackages.pnpm nodejs php82 php82Packages.composer ]; };
+        mkShell { buildInputs = with pkgs; [ bashInteractive nodePackages.pnpm nodejs php82 php82Packages.composer ]; };
 
       formatter.${system} = pkgs.nixfmt;
     };