devShells: make all shells inherit from default shell

Currently, important tools from the default shell are lost as soon as select-shell is used to switch to another shell. select-shell itself, for example is missing, which makes it impossible to switch back to another shell.

pkgs/clan-cli/flake-module.nix

@@ -39,7 +39,10 @@
     in
     {
 
-      devShells.clan-cli = pkgs.callPackage ./shell.nix { inherit (self'.packages) clan-cli; };
+      devShells.clan-cli = pkgs.callPackage ./shell.nix {
+        inherit (self'.packages) clan-cli;
+        inherit self';
+      };
       packages = {
         clan-cli = pkgs.python3.pkgs.callPackage ./default.nix {
           inherit (inputs) nixpkgs;

pkgs/clan-cli/shell.nix

@@ -4,6 +4,7 @@
   mkShell,
   ruff,
   python3,
+  self',
 }:
 let
   devshellTestDeps =
@@ -22,6 +23,8 @@ mkShell {
     ruff
   ] ++ devshellTestDeps;
 
+  inputsFrom = [ self'.devShells.default ];
+
   PYTHONBREAKPOINT = "ipdb.set_trace";
 
   shellHook = ''