updated dockerfile to open correct port

Dockerfile

@@ -1,17 +1,7 @@
 # Use an official Python runtime as a parent image
 FROM python:3.8-slim-buster
-
-# Set the working directory in the container to /app
 WORKDIR /app
-
-# Add the current directory contents into the container at /app
 ADD . /app
-
-# Install any needed packages specified in requirements.txt
 RUN pip install --no-cache-dir -r requirements.txt
-
-# Make port 80 available to the world outside this container
-EXPOSE 80
-
-# Run app.py when the container launches
+EXPOSE 5000
 CMD ["python3", "app.py"]