Cannot find Dockerfile in Fly.io

Hi, I am deploying Tiny Core Linux on Fly.io and would like to use this container. It isn't able to find the docker file despite it being in one of the folders. Is there a way to point it to the correct directory? 

<img width="1920" height="1200" alt="Image" src="https://github.com/user-attachments/assets/69c5b501-eb40-49e3-ba62-9062bef7c717" />