Use @// instead of @${workspace_name}// (#558)
Use @// instead of @${workspace_name}// (#558)

@// refers to the root workspace of the bazel invocation, regardless of
which repository it's referred to in.

This avoids needing to run `bazel info` from inside the `bazel run`.
bazelbuild/rules_jvm_external,bazelbuild/rules_jvm_external,bazelbuild/rules_jvm_external