Yaml file issue

Hi,
I have a yaml file within python code, I use the following dockerfile for configuration

    FROM python:3
    WORKDIR .
    COPY requirements.txt ./
    RUN pip install --no-cache-dir -r requirements.txt
    COPY . .
    CMD [ "python", "./main.py" ]

The yaml file was not copied.
Any idea how to resolve this?

Best regards,