About using GitHub.com actions on GitHub Enterprise Server→
GitHub Enterprise Server includes most GitHub-authored actions, and has options for enabling access to other actions from GitHub.com and GitHub Marketplace.
Setting up the tool cache on self-hosted runners without internet access→
To use the the included actions/setup actions on self-hosted runners without internet access, you must first populate the runner's tool cache for your workflows.
Manually syncing actions from GitHub.com→
For users that need access to actions from GitHub.com, you can sync specific actions to your GitHub Enterprise Server instance.
Enabling automatic access to GitHub.com actions using GitHub Connect→
To allow GitHub Actions on your enterprise instance to use actions from GitHub.com, you can connect Ihre GitHub Enterprise Server-Instanz to GitHub Enterprise Cloud.