Publishing actions in GitHub Marketplace
You can publish actions in GitHub Marketplace and share actions you've created with the GitHub community.
Prerequisite include:
[B] Each repository must contain a single action metadata file (action.yml or action.yaml) at the root.
The name in the action's metadata file must be unique.
The name cannot match an existing action name published on GitHub Marketplace.
[C] The name cannot match a user or organization on GitHub, unless the user or organization owner is publishing the action. For example, only the GitHub organization can publish an action named github.
Reference:
https://docs.github.com/en/actions/how-tos/create-and-publish-actions/publish-in-github- marketplace