Yeah, we do the same thing. This seems to work pretty well, except right now we build these images out of band of our normal build process (if you change these base images, you're expected to kick off another CI job that builds/pushes new versions and updates the versions in the FROM statements in our production Dockerfiles (and our docker-compose.ymls). I'm not sure why we're doing this, since the build cache is actually pretty good at avoiding unnecessary base image builds.