Adding an action to your workflow
You can add an action to your workflow by referencing the action in your workflow file. The actions you use in your workflow can be defined in:
[F] The same repository as your workflow file
[C] Any public repository
[B] A published Docker container image on Docker Hub
Note: Adding an action from the same repository [F]
If an action is defined in the same repository where your workflow file uses the action, you can reference the action with either the {owner}/{repo}@{ref} or ./path/to/dir syntax in your workflow file.
Reference:
https://docs.github.com/en/actions/how-tos/write-workflows/choose-what-workflows-do/find-and- customize-actions