Add custom docker file

Dockerfile

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+FROM python:3.12
+
+WORKDIR /code
+
+COPY ./requirements.txt /code/requirements.txt
+
+# Install Python dependencies:
+RUN pip install --no-cache-dir --upgrade -r /code/requirements.txt
+
+# Install Julia:
+RUN python -c "import pysr"
+
+# Set up a new user named "user" with user ID 1000
+RUN useradd -m -u 1000 user
+USER user
+ENV HOME=/home/user
+ENV PATH=/home/user/.local/bin:$PATH
+
+WORKDIR $HOME/app
+
+COPY --chown=user . $HOME/app
+
+CMD ["python", "app.py"]