Use consistent apt sources across servers

Servers on different providers had different apt sources by default. For
instance - some enabled trixie-backports while others did not. This lack of
consistency could lead to unexpected problems in the future - so ensure all
servers use consistent apt sources now.

Preserve the ability to use use mirrors by making uri a configurable parameter.
Likewise - make debian_version a configurable parameter. While I could set the
distribution to stable, I don't want to risk an upgrade moving onto a new
stable release without it being my explicit choice - a variable allows me to
set the version as trixie as well as upgrade servers incrementally (first in
staging, then transport, then prod).

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