We just released composite run steps actions: https://github.blog/changelog/2020-08-07-github-actions-composite-run-steps/ .
Thank you to those who have been requesting for this feature and those who helped us throughout the process.
Some of you may be wondering about what steps we are taking to make a fully functioning composite actions, so I wrote a few notes here: https://github.com/actions/runner/issues/646 . In this issue, we also cover 6 use cases that you can experiment with for composite run steps actions.
If you have any questions, comments, or concerns, feel free to post in the issue thread above .