update dockerfile

Dockerfile

@@ -10,8 +10,11 @@ ADD . /app
 # Install any needed packages specified in requirements.txt
 RUN pip install --no-cache-dir -r requirements.txt
 
-# Make port 5000 available to the world outside this container
-EXPOSE 5000
+# Make port 7860 available to the world outside this container
+EXPOSE 7860
+
+# Define environment variable
+ENV NAME World
 
 # Run app.py when the container launches
 CMD ["python", "app.py"]