I think we actually built the wheel for grpcio correctly in the build-stage, and that was transferred, but I hesitated on that when I saw changes compared to a Dockerfile in z2jh.
With this, I'm making the Dockerfiles align, but in practice the reason for #1636 is that it takes ages to build grpcio on arm64 where they don't have a wheel published.
I think we actually built the wheel for grpcio correctly in the build-stage, and that was transferred, but I hesitated on that when I saw changes compared to a Dockerfile in z2jh.
With this, I'm making the Dockerfiles align, but in practice the reason for #1636 is that it takes ages to build
grpcio
on arm64 where they don't have a wheel published.