Have you developed Docker images in your practice?

Yes, in my practice I have created Docker images for automating testing and deployment of applications. For example, you can write a Dockerfile that installs the necessary dependencies and runs tests:

FROM python:3.9-slim
WORKDIR /app
COPY requirements.txt ./
RUN pip install -r requirements.txt
COPY . ./
CMD ["pytest"]

Such an image allows running tests in an isolated environment, which improves reproducibility and ease of integration into CI/CD pipelines.