From bin/docker-build-go-deps:

if (docker_pull go-deps "${tag}"); then
    echo "$(docker_repo go-deps):${tag}"
else
    docker_build go-deps "${tag}" Dockerfile-go-deps
fi

docker_pull (I'm guessing) is outputting the error Error response from daemon: manifest for gcr.io/runconduit/go-deps:aac93646 not found. This is confusing because it makes it look like the docker build will happen just fine since we'll fall back to docker_build to build it.

We should change the build system so this message isn't printed.