try a Dockerfile

Dockerfile

@@ -0,0 +1,7 @@
+# Install base image. Optimized for Python.
+FROM python:3.7-slim-buster
+# RUN apt-get update && apt-get install gcc g++ -y && apt-get clean
+RUN pip install gradio
+ADD . /app
+WORKDIR /app
+CMD ["python", "app.py"]