Add devcontainer setup

[somet-code]

In the 260616 Maintainers meeting, we saw how to add a devcontainer setup so we can use Codespaces to view changes. This PR adds the set up from https://github.com/carpentries/workbench-template-md.

[github-actions]

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⏱️ Updated at 2026-06-16 18:35:39 +0000