will this be included/backported to the default docker images?
The change has been submitted to the official docker images repo: [ros] install dedicated deb to setup apt gpg key instead of installing keys the old way by mikaelarguedas · Pull Request #19162 · docker-library/official-images · GitHub
It might take a couple days to take effect (review/merge/rebuild/rebuild of downstream images)
Thanks @tfoote for the help getting this out promptly!