chore: changes from upstream docker install #2551
Merged
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Incorporate changes from the official install instructions.
docker/docs@33befd6
Fix apt-get ascii GPG key
Changing the file extension for the GPG key to .asc lets apt-get know the GPG key is in ascii armor format, no need to dearmor.
docker/docs@1b49c84
engine: add chmod a+r for gpg key
docker/docs@6dc6f50
engine: remove gnupg from install prerequisites