Update install.sh

[hmag]

Following https://stackoverflow.com/a/68764068 to make it work on Debian & Ubuntu cloud images (LXD, AWS, ...)

Edit : after investigation, on my Debian 11 LXD container, my umask was 0027, therefore the key file /usr/share/keyrings/docker-archive-keyring.gpg was not world readable.
Nevertheless I think this pull request is still relevant to make the script work whatever the umask is...

[fortuna]

@hmag I wonder if the reviewers are waiting on the PR checks to pass.

[warengonzaga]

Looks like there are many warnings here.

[DaspawnW]

It seems this is a valid fix for #244, tested it on AWS:
Linux 5.11.0-1020-aws #21~20.04.2-Ubuntu SMP Fri Oct 1 13:03:59 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux

[hmag]

Hi,
Actually, I proposed this pull request, but as I'm not familiar with Github, I don't know how to cope with next steps (ask review approval, check out the pull request, ...).
So it may be a good idea if someone reading this message with more knowledge on Github could register appropriately this pull request on his side, I would then cancel mine...
(but still, I'm happy to read that it may have saved some time for some guys facing the same problem)

[thaJeztah]

Thanks for contributing; CI was failing because the commit was missing a DCO sign-off line. I opened a replacement PR with this change (and added you as "co-authored-by" in the commit message 👍)