[PATCH pve-docs 1/1] software updates: add short section about unattended-upgrades

[Nicolas Frey <n.frey@proxmox.com>]

as it has increasingly come up in enterprise support, where it would be
of use to have something in our own docs to quote about this topic.

this is somewhat of a follow-up to commit 86bddb2e3d39 that introduced a
warning right above this section about partial upgrades using `apt
upgrade`.

Signed-off-by: Nicolas Frey <n.frey@proxmox.com>
---

Notes:
    This was discussed off-list a bunch with Laurențiu, only found
    time now to get to this.

    Same as for the series for adding the warning for partial upgrades,
    this is intended to be sent to the docs of all other products too. just
    gathering feedback here first.

 system-software-updates.adoc | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/system-software-updates.adoc b/system-software-updates.adoc
index aa8f90d..483863c 100644
--- a/system-software-updates.adoc
+++ b/system-software-updates.adoc
@@ -26,3 +26,11 @@ features, see `man apt`, or <<Hertzog13>> for additional information.

 TIP: Regular updates are essential to get the latest patches and security
 related fixes. Major system upgrades are announced in the {forum}.
+
+Unattended Upgrades
+^^^^^^^^^^^^^^^^^^^
+`unattended-upgrades` cannot be configured to perform an equivalent
+action to `apt full-upgrade`, which is required for {pve} repositories
+to ensure full system updates. However, Debian base repositories can be
+configured to be automatically updated this way by using `Origins-Pattern`
+to only match a specific origin and/or suite.
--
2.47.3