Can docker hub automated builds cache NPM

Docker Hub
1

Currently we build docker images on our own infrastructure and can cache NPM packages. This speeds up the build time in case the package.json/package-lock.json changes (otherwise it should use a cached layer).

I cannot find in the documentation if:

  1. Docker hub automated builds uses cached layers of previous versions of the Docker image?
  2. Is there functionality to keep a cache accross builds?

Does anyone know this? For (1) I only found a Stack Exchange question that was answered in 2024 (dockerhub - Does hub.docker.com use "--no-cache" for automated builds? - Stack Overflow)

2

Docker build supports storing the cache in a registry like Docker Hub