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Fix `test_mulled_build.py::test_mulled_build_files_cli` with `use_mamba=True`
Test `tests/tool_util/mulled/test_mulled_build.py::test_mulled_build_files_cli[True]`, where `[True]` refers to the parameter `use_mamba`, fails because if `conda install --quiet --yes 'mamba='` (the preinstall command) runs before `mamba install -p /usr/local`, then the latter expects either `/usr/local` not to exist or to be an existing environment. To work this around, create an environment in `/usr/local/env`, but still put it on the expected location `/usr/local` later.