You get input from environment variables. More info here:
- https://help.github.com/en/articles/metadata-syntax-for-github-actions#inputs
- https://help.github.com/en/articles/*orkflow-syntax-for-github-actions#jobsjob_idstepswith
- https://help.github.com/en/articles/virtual-environments-for-github-actions#environment-variables
You can set output and invoke workflow actions by writing commands to the console output. More info here: