Ensure not using the current FROM alias as COPY '--from' value

Copying from container to itself is generally are not common and can ocurred by mistyping or confusing.

Risk Level: medium
Platform: Docker
Spectral Rule ID: DOCKR012


Instead of copy file between container and itself, you can use RUN cp and get the same functionality.

FROM someimage:tag as build
- COPY --from=build /binary /
+ RUN cp /binary /
RUN python main.py

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