Update Dockerfile to use Python 3.8 and set working directory

Dockerfile

@@ -1,14 +1,20 @@
-# read the doc: https://huggingface.co/docs/hub/spaces-sdks-docker
-# you will also find guides on how best to write your Dockerfile
+# Use an official Python runtime as a parent image
+FROM python:3.8
 
-FROM python:3.9
+# Set the working directory in the container
+WORKDIR /usr/src/app
 
-WORKDIR /code
+# Copy the current directory contents into the container at /usr/src/app
+COPY . .
 
-COPY ./requirements.txt /code/requirements.txt
+# Install any needed packages specified in requirements.txt
+RUN pip install --no-cache-dir -r requirements.txt
 
-RUN pip install --no-cache-dir --upgrade -r /code/requirements.txt
+# Make port 80 available to the world outside this container
+EXPOSE 80
 
-COPY . .
+# Define environment variable
+ENV NAME World
 
-CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "7860"]
+# Run app.py when the container launches
+CMD ["python", "./app.py"]