nix: don't inject invoke/bumpversion in default shell, we use our own py3 compat, and want to have an option to skip it

shell.nix

@@ -6,6 +6,7 @@
 , doCheck ? false
 , sourcesOverrides ? {}
 , doDevelopInstall ? true
+, doReleaseInstall ? false
 }:
 
 let
@@ -69,11 +70,12 @@ in enterprise-ce.override (attrs: {
   # Add dependencies which are useful for the development environment.
   buildInputs =
     attrs.buildInputs ++
-    (with ce-pythonPackages; [
+    (with ce-pythonPackages;
-      bumpversion
+      [ ipdb ]
-      invoke
+      ++ pkgs.lib.lists.optionals doReleaseInstall (
-      ipdb
+        [invoke bumpversion]
-    ]);
+      )
+    );
 
   # place to inject some required libs from develop installs
   propagatedBuildInputs =