Calling a reusable workflow
You call a reusable workflow by using the uses keyword. Unlike when you are using actions within a workflow, you call reusable workflows directly within a job, and not from within job steps.
jobs.<job_id>.uses
You reference reusable workflow files using one of the following syntaxes:
*-> {owner}/{repo}/.github/workflows/{filename}@{ref} for reusable workflows in public and private repositories.
* ./.github/workflows/{filename} for reusable workflows in the same repository.
Reference:
https://docs.github.com/en/actions/how-tos/reuse-automations/reuse-workflows