Make workflow run sequentially, allowing one job run at a time for Github Action reusable workflow

Firstly I created a test in my GitHub profile, as repoA, repoB and ci-orchestrator. You may check them out if you want example on how to create the .yml files for dispatch.yaml and handle-dispatch.yml

GitHub Actions' concurrency only works within a single repository. If multiple repositories use the same reusable workflow, adding:

concurrency:
  group: global-group
  cancel-in-progress: false

…won’t prevent parallel executions across repos, because GitHub scopes concurrency groups per repo.

What you can do is, create a Orchestrator Repository + repository_dispatch

• In each repo (e.g., repo-a, repo-b, repo-c), define a minimal dispatcher

• In orchestrator Repository create reusable-workflow.yml and handle-dispatch.yml

  in that way

  1. All jobs from any repo go through the orchestrator

  2. Only one job runs at a time, others are queued, not canceled