update to use gunicorn with flask

Dockerfile

@@ -11,4 +11,4 @@ RUN pip install --no-cache-dir --upgrade -r requirements.txt
 
 COPY --chown=user . /app
 
-CMD ["uvicorn", "app:app", "--host", "0.0.0.0", "--port", "7860"]
+CMD ["gunicorn", "-w", "2", "-b", "0.0.0.0:7860", "app:app"]

requirements.txt

@@ -10,4 +10,4 @@ transformers
 librosa
 matplotlib
 statsmodels
-uvicorn
+gunicorn