<p></p>
<p>Seems my worries <em>were</em> warranted -- one of the build environments <a href="https://github.com/RIOT-OS/RIOT/runs/3411537020?check_suite_focus=true">doesn't even know <code>command</code></a>.</p>
<p>No clue why (the python-tests job of .github/workflows/tools-test.yml is supposed to be run on ubuntu-latest whose shells do know command), but I'll revert this to only being the first commit which is minimally fixing things, and see to the rest in a follow-up.</p>

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