Add ci-template-check.yml

[trexfeathers]

See SciTools/.github#41 for the detailed context. Will need calling workflows on each of our repos.

Do we still believe in the workflows repository?

I personally have experienced a lot of frustrations of having one workflow that affects all repositories, as it gets in the way of me introducing a new concept (e.g. #28), means mistakes have large impacts (e.g. #88 vs #93), and makes it difficult to test things (e.g #108).

Templating is an alternative way of achieving the same thing, without the above problems. HOWEVER: we have agreed among the core devs that templating needs to be demonstrated to work BEFORE we apply it to workflows. In the meantime I felt it was important to embrace our current way of working.

Dependent PRs

• Tephi: Add ci-template-check.yml tephi#206
  Plan to merge and test this before raising PRs on all the other repos
• Iris: Add ci-template-check.yml iris#6377
• Iris-grib: Add ci-template-check.yml iris-grib#628
• Python-stratify: Add ci-template-check.yml python-stratify#330
• Iris-esmf-regrid: Add ci-template-check.yml iris-esmf-regrid#484
• Cf-units: Add ci-template-check.yml cf-units#574
• Nc-time-axis: Add ci-template-check.yml nc-time-axis#344
• test-iris-imagehash: Add ci-template-check.yml test-iris-imagehash#125
• workflows itself?: Add ci-template-check-pr.yml #117

[ESadek-MO]

All dependent PRs have now been merged.