GitHub Actions now supports self-hosted runners. Hosting your own runners offers maximum flexibility and control of your workflows. Self-host your runners if you need a proprietary image or container, access to on-prem resources, or a more powerful machine. Learn more about using self-hosted runners with your workflows here.
You’re now required to obtain an OAuth token via the web application flow for SAML access to organizations requiring SSO. In most cases, this change also prohibits access via tokens granted from the Authorizations API.
Learn more about upcoming security API deprecations announcements
Using the cache action you can now cache your dependencies between workflow runs. This can dramatically reduce the time it takes to run certain steps in your workflow. The rails/rails repository recently started using the cache action in their rubocop workflow reducing the runtime from around seven minutes to roughly one minute.