Merge pull request #309672 from impl/azure-cli-add-pip

azure-cli: fix installing extensions externally

pkgs/tools/admin/azure-cli/default.nix

···
     wcwidth
     websocket-client
     xmltodict
+  ] ++ lib.optionals (!withImmutableConfig) [
+    # pip is required to install extensions locally, but it's not needed if
+    # we're using the default immutable configuration.
+    pip
   ];
 
   postInstall = ''