octoprint: fix overlay composition

                hash = "sha256-DCUesPy4/g7DYN/9CDRvwAWHcv4dFsF+gsysg5UWThQ=";

              };

              propagatedBuildInputs = with super; [

              propagatedBuildInputs = with self; [

                argon2-cffi

                blinker

                cachelib

                py.pkgs.appdirs

              ];

              checkInputs = with super; [

              checkInputs = with self; [

                ddt

                mock

                pytestCheckHook

                # substitute pip and let it find out, that it can't write anywhere

                (substituteAll {

                  src = ./pip-path.patch;

                  pip = "${super.pip}/bin/pip";

                  pip = "${self.pip}/bin/pip";

                })

                # hardcore path to ffmpeg and hide related settings