Add devcontainer support

[froggleston]

Following on from the same implementation in carpentries/workbench-template-rmd#89, this PR adds devcontainer support for our Workbench templates

[github-actions]

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🔍 Inspect the changes: https://github.com/carpentries/workbench-template-md/compare/md-outputs..md-outputs-PR-66

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⏱️ Updated at 2025-07-24 13:02:50 +0000