add ubuntu-keyring sources needed when rebuilding rootfs#1564
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Signed-off-by: Sho Uemura <suemura@fnal.gov>
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When building a ZCU208 image with
REBUILD_PYNQ_ROOTFS=1, multistrap was giving me the same error (E: Can't find a source to download version '2021.03.26' of 'ubuntu-keyring:amd64') reported by https://discuss.pynq.io/t/pynq-image-v3-1-for-pynq-z1-build-fails-during-rootfs-multistrap-ubuntu-keyring-error/8691.It looks like this error is related to secure apt (https://manpages.ubuntu.com/manpages/jammy/man1/multistrap.1.html#secure-apt) and the fix is to either use
--no-author add the APT repository with the ubuntu-keyring sources before running multistrap. Here I tweak the Dockerfile and create_rootfs.sh to do the latter.I'm also moving the tzdata configuration into its own command, for ease of understanding - this isn't strictly necessary, it's just something that confused me during debugging.