I have a GitHub Actions plugin, which runs in a Docker container, as explained here. This is how people use my plugin in their workflows:

on:
  push:
jobs:
  foo:
    runs-on: ubuntu-22.04
    steps:
      - uses: actions/checkout@v4
      - uses: yegor256/foo-action@master

Every time a push happens in their repository, GitHub builds a new Docker image using Dockerfile from my yegor256/foo-action (fake name) repository. Obviously, I would like to use cache and avoid long Docker build process on every push. How do I do this? I did read about caching of Docker builds inside repositories that use Dockerfile, but my case is different, I believe, because I need to cache the image of my plugin, not the repository that uses it.