Mamba fails to create environment because the `--yes` flag is not supplied

Mamba fails to create environment because the --yes flag is not supplied.
Adding conda.createOptions = '--yes' does not help either.

  Failed to create Conda environment
    command: mamba env create --prefix ./work/conda/env-961b98c89213eaa1-e6f0bafd6827065b938c2602e5e8feef --file ./envs/seqkit_env.yaml
    status : 143
...
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