Compliance with Deb822: Deprecated sources.list use .sources instead

[eshattow]

File: engine/install/debian.md

sources.list(5) says of the Deb822 ".sources" format "It is intended to make this format gradually the default format, deprecating the previously described one-line-style format, as it is easier to create, extend and modify for humans and machines alike..."

https://wiki.debian.org/DebianRepository/UseThirdParty

Note for clarity /etc/apt/keyrings as the Docker install guide suggest is in fact the correct location for a keyring installed by the system operator, so the guide gets it half-right already.

[docker-robott]

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/lifecycle stale

[eshattow]

/remove-lifecycle stale
/lifecycle frozen

[eshattow]

deb822 format will be the default for the next Debian release (either trixie or trixie+1) c.f. debuerreotype/debuerreotype#128

See comparable examples of how to form documentation for users:
https://wiki.winehq.org/Debian
https://qgis.org/en/site/forusers/alldownloads.html#debian-ubuntu

[eshattow]

Trixie is released and now stable see also #23231

[oconnordaniel]

I probably put these comments on the wrong issue... but for the googlers finding this...

#23231 (comment)

[dvdksn]

Implemented in #23249