docker: Add rust-sdk memcheck target.

docker: Separate and tweak cargo cache paths.

ci: Improve memcheck job targets.

cargo: Add missing debug syms to bench profile.

docker: Optimize layer copying.

Signed-off-by: Jason Volk <jason@zemos.net>

docker/Dockerfile.system

@@ -12,9 +12,6 @@ ARG var_lib_apt
 ARG packages
 ARG DEBIAN_FRONTEND
 
-WORKDIR /
-COPY --link --from=input . .
-
 ENV DEBIAN_FRONTEND="${DEBIAN_FRONTEND}"
 RUN \
 --mount=type=cache,dst=/var/cache,id=${var_cache},sharing=locked \