attempt to fix file does not exist error

Dockerfile

@@ -1,6 +1,6 @@
 FROM bitnami/pytorch
 
-RUN mkdir --mode 700 /app/my_streamlit_app
+RUN mkdir --mode 755 /app/my_streamlit_app
 WORKDIR /app/my_stramlit_app
 
 COPY ./requirements.txt /app/my_streamlit_app/requirements.txt
@@ -15,6 +15,7 @@ ENV TRANSFORMERS_CACHE="/app/my_streamlit_app/.cache/transformers"
 
 COPY . /app/my_streamlit_app/
 
-RUN ls -la /app/my_streamlit_app/
+# check if app/my_streamlit_app/app.py exists
+RUN test -f /app/my_streamlit_app/app.py
 
 CMD ["streamlit", "run", "/app/my_streamlit_app/app.py"]