Additional permission fix required on Debian 11

[philippm]

File: engine/install/debian.md

The document offers a section on solving GPG errors with apt-get update:

sudo chmod a+r /etc/apt/keyrings/docker.gpg
sudo apt-get update

That didn't quite fix it for me, I had to grant read/list permissions to the keyrings folder:

sudo chmod a+rx /etc/apt/keyrings

Perhaps it would be good to add this to the docs?

[docker-robott]

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[docker-robott]

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