Update Debian/Ubuntu section of installing-atom.d

[ThamesDev]

Description of the Change

In your detailed Debian/Ubuntu installation guide, the command apt-key is used. This command is being deprecated. Instead, I'd like to suggest this more future-proof option, using gpg --dearmor | sudo tee /usr/share/keyrings/atom-archive-keyring.gpg. Please tell me if there are any modifications you'd like me to make.

Release Notes

N/A

[hwittenborn]

In their defense packagecloud themselves are recommending the apt-key approach.

Regardless, I completely agree. Exporting to a keyfile is way more secure, as the GPG key would then only be able to verify packages for the Atom repository, and not things like the Debian and Ubuntu repositories.

[hwittenborn]

All looks good to me.

[hwittenborn]

This last thing isn't required or anything, but just a general improvement:

This line:

 $ sudo sh -c 'echo "deb [signed-by=/usr/share/keyrings/atom-archive-keyring.gpg arch=amd64] https://packagecloud.io/AtomEditor/atom/any/ any main" > /etc/apt/sources.list.d/atom.list'

could be:

 $ echo "deb [signed-by=/usr/share/keyrings/atom-archive-keyring.gpg arch=amd64] https://packagecloud.io/AtomEditor/atom/any/ any main" | sudo tee /etc/apt/sources.list.d/atom.list'

You're thus only running the sudo command when writing out to the file (that part isn't really a big deal though), and it's just a bit cleaner imo.

[ThamesDev]

Sorry I didn't reply to this earlier, that's a good idea, I'll do it when I next have access to my laptop.

[hwittenborn]

All good! Sounds great then too.

[hwittenborn]

Actually, on second though now, it would probably be a better idea to make that a separate PR. If the people on the Atom team end up not wanting to change the command, it's just going to be tedious to have to change everything again.

[ThamesDev]

Ok, so it's ready then.