Creating a Docker container action
Create a dockerfile
Dockerfile support for GitHub Actions
When creating a Dockerfile for a Docker container action, you should be aware of how some Docker instructions interact with GitHub Actions and an action's metadata file.
Creating an action metadata file
Create a new action.yml file.
Reference:
https://docs.github.com/en/actions/tutorials/use-containerized-services/create-a-docker-container- action
https://docs.github.com/en/actions/reference/workflows-and-actions/dockerfile-support