Add a SHA256 for containerregistry.tar.gz (#418)
Add a SHA256 for containerregistry.tar.gz (#418)

This avoids the INFO: SHA256... build spam with bazel 0.14.0.

Two SHAs already have to be updated when changing
CONTAINERREGISTRY_RELEASE, so adding a third shouldn't be a problem.
bazelbuild/rules_docker,bazelbuild/rules_docker,bazelbuild/rules_docker,bazelbuild/rules_docker