add xenomai

hc

2024-11-01 2f529f9b558ca1c1bd74be7437a84e4711743404

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# Latest just before 20210817T000000Z:
deb [check-valid-until=no] http://snapshot.debian.org/archive/debian/20210902T205533Z/ bullseye main
deb [check-valid-until=no] http://snapshot.debian.org/archive/debian-security/20210902T193650Z/ bullseye-security main
deb [check-valid-until=no] http://snapshot.debian.org/archive/debian/20210902T205533Z/ bullseye-updates main