Rust deployment via docker

I am trying to deploy a rust application. My entrypoint is set to “/app/start.sh” and start.sh runs my rust binary. I have ensured proper copying and access to start.sh

COPY start.sh /app/start.sh
RUN chmod +x /app/start.sh

On render I am getting error
exec /app/start.sh: no such file or directory

I did an override of Deply command and did ls to view the file structure. There is one being created as /data. No /app directory is made. My docker container in local on the other hand has all the folder structures that are created in docker file