When attempting to update golden files according to readme for #3810:

Does not work for my local development out of box:

1. docker build and run. Run docker command without "sudo" is discouraged (go/installdocker#sudoless-docker )
   

   sdk-platform-java/java-showcase/scripts/generate_showcase.sh

   Line 56 in 49a7ae5

   DOCKER_BUILDKIT=1 docker build --file .cloudbuild/library_generation/library_generation.Dockerfile --iidfile image-id .

   
   

   sdk-platform-java/java-showcase/scripts/generate_showcase.sh

   Line 76 in 49a7ae5

   docker run \

2. COPY step in Dockerfile. These two lines gives me "COPY failed: no source files were specified". I was able to get pass errors and successfully update files by removing these two lines. Though I am not familiar with it to determine if they are truely redundant?
   

   sdk-platform-java/.cloudbuild/library_generation/library_generation.Dockerfile

   Line 74 in 49a7ae5

   COPY --from=glibc-compat /etc/libgcc* /etc/

   
   

   sdk-platform-java/.cloudbuild/library_generation/library_generation.Dockerfile

   Line 79 in 49a7ae5

   COPY --from=glibc-compat /lib/libucontext* /lib/

my local docker version:
Docker version 20.10.21

Need more context to determine if need fix to these, or updates in readme are sufficient.