Ease adoption and maintenance of GitHub Actions with org-level re-usable workflows / starter workflows

[MattF-NSIDC]

https://docs.github.com/en/actions/using-workflows/reusing-workflows#reusable-workflows-and-starter-workflows

[MattF-NSIDC]

This looked fun so I explored some in my free time. This repo is now configured with a starter workflow (/workflow-templates/) and a re-usable workflow (/.github/workflows/).

Get started with the starter workflow in any repo by going to the "Actions" tab, and clicking "New workflow", then select from the "By National Snow and Ice Data Center" section.

I tested it on QGreenland and seems to be working fine. nsidc/qgreenland#709

[MattF-NSIDC]

We could add a "conda lock" workflow that updates the conda lockfile on slash command /condalock on a PR:

https://github.com/CryoInTheCloud/hub-image/blob/main/.github/workflows/conda-lock-command.yml

Used in a PR:

https://github.com/CryoInTheCloud/hub-image/blob/main/.github/workflows/conda-lock-command.yml

[MattF-NSIDC]

Or a re-usable workflow that checks if a conda-lock lockfile needs to be updated.

conda/conda-lock#479