Can someone please revisit debian-sid-ports and add tests for it? I hacked it to work locally (archive 2021 key and “buster” InRelease key), but I am not familiar enough to know what is hack and what was necessary. Proving sifive-fu540 is buildable should be enough.

I've just sent `[PATCH 0/2] Fix isar-bootstrap for sifive-fu540` on maillist, but there are still more issues at least with cowsay, hello and kernel building.
Adding sifive-fu540 to CI is also planning to be done.

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