Add an integration test for import of .proto from another package bp2build will automatically create a proto_library in `subpackage`, but that is not compile-able since it does not have a dep on the proto_library for `foo.proto`. bp2build handles this by adding `manual` to the proto_library target. Test: b build //bazel/build/examples/... Change-Id: I1ec4a9ec3e1d28b2ba3917a636b754ab53675bf5