This is pretty awesome. I wonder if you could copy from the builder stage to the tests_builder stage by modifying tests_builder to copy from the builder stage like so:
FROM test_deps as tests_builder
COPY --from=builder ./src ./src
COPY tests ./tests
Disclaimer: I'm not 100% sure this would fit your use case, but it's worth a shot. If you try this out, let us know how it worked for you.
You can definitely do this, but Docker still has to create a new layer for it. Copying it from the builder stage could definitely help if building the src dir is more complicated than copying over a single directory.
That's true, I didn't think of the extra layer Docker would add in the process.
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