Final debug helper images must be for target platform #78
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Fixes: GoogleCloudPlatform/cloud-code-samples#721
The debug support images are
busyboximages is essentially a little script that copies set of files required for a particular language runtime to a specific directory. This script is a Bourne shell script.Due to an error in the Dockerfiles, these debug support images were being created using the build-platform's os/arch. As the images are built from a linux/amd64, the linux/arm64 debug support image had a linux/amd64
/bin/shand so failed on a linux/arm64. My testing is on an Apple M1 with Docker Desktop, which includes qemu-based binfmt_misc binaries and so silently executes linux/amd64 binaries.