The warning that concurrency is not available for reusable workflow is no more relevant.

[Ameausoone]

Concurrency is now supported when we call reusable workflow like :

jobs:
  checks:
    concurrency:
      group: ${{ github.ref }}-${{ github.workflow }}-checks
      cancel-in-progress: true
    uses: ./.github/workflows/unit_tests_and_linters.yaml

So the error .github/workflows/all_in_one.yml:45:5: when a reusable workflow is called with "uses", "concurrency" is not available. only following keys are allowed: "name", "uses", "with", "secrets", "needs", "if", and "permissions" in job "full" [syntax-check]is no more relevant.

The documentation do not mention it yet https://docs.github.com/en/actions/using-workflows/reusing-workflows#supported-keywords-for-jobs-that-call-a-reusable-workflow (But I open a PR github/docs#17469)

[rhysd]

Thanks. I'll fix this at next version.

[rhysd]

I added fix for this issue at issue-136 branch. But let me merge the branch after github/docs#17469 is closed for ensuring that this is an expected behavior.

[rhysd]

As per this comment, I confirmed this behavior is intended. I'll merge the branch.