Update dockerfile

dockerfile

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+# Use an official Python runtime as a parent image
+FROM python:3.8-slim
+
+# Set the working directory inside the container
+WORKDIR /app
+
+# Copy the current directory contents into the container at /app
+COPY . /app
+
+# Install Flask
+RUN pip install --no-cache-dir flask
+
+# Set the environment variable for Flask
+ENV FLASK_APP=app.py
+ENV FLASK_RUN_HOST=0.0.0.0
+
+# Expose port 5000 for the Flask app
+EXPOSE 5000
+
+# Run the Flask application
+CMD ["flask", "run", "--host=0.0.0.0", "--port=5000"]