buildroot/support/docker/apt-sources.list

# Latest just before 20211115T000000Z:
deb [check-valid-until=no] http://snapshot.debian.org/archive/debian/20211114T204852Z/ stretch main
deb [check-valid-until=no] http://snapshot.debian.org/archive/debian/20211115T000000Z/ stretch-updates main
deb [check-valid-until=no] http://snapshot.debian.org/archive/debian-security/20211114T121535Z/ stretch/updates main