content: FROM busybox as base 
  WORKDIR /app
  
  # ------
  FROM python:3.10-alpine as build
  WORKDIR /src 
  COPY . . 
  
  # build
  RUN python build.py
  
  # ------
  FROM base 
  WORKDIR /app
  COPY --from=build /src/output.txt /app/
  CMD [ "cat", "output.txt" ]
  