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Major-changes: Document the switch to OCI for updates #698

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With the f42 rebase we will switch disk images to use OCI for updates. While this is transparent for most users, it's still a big technical change so it's worth mentionning it, at least so users using can look into it.

See https://fedoraproject.org/wiki/Changes/CoreOSOstree2OCIUpdates coreos/fedora-coreos-tracker#1823

With the f42 rebase we will switch disk images to use OCI for
updates. While this is transparent for most users, it's still a big
technical change so it's worth mentionning it, at least so users using
can look into it.

See https://fedoraproject.org/wiki/Changes/CoreOSOstree2OCIUpdates
coreos/fedora-coreos-tracker#1823

=== Planning

This change has been introduced first in bootimages for the testing stream, for the Fedora 42 rebase. After a few releases
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Suggested change
This change has been introduced first in bootimages for the testing stream, for the Fedora 42 rebase. After a few releases
This change will be introduced first in new disk images for the testing stream, as part of the rebase to Fedora 42. After a few releases

|===
|Update Stream |Targeted release date

|`next` | 2025-02-04
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Those dates may change so let's write the condition (first release on F42) here instead. We'll update the page once we have the exact releases.

With this change, the hosts will pull updates from the Quay.io container registry instead.
This is a transparent change, except for proxied environnements, as the nodes will reach to a different address for updates.

Note: Disk images will be updated first, so new installations of F42 based Fedora CoreOS will use OCI images.
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Suggested change
Note: Disk images will be updated first, so new installations of F42 based Fedora CoreOS will use OCI images.
Note: Disk images will be updated first, so new installations of Fedora CoreOS based on Fedora 41 will use OCI images.


Currently, Fedora CoreOS hosts pull updates from the OSTree repository.
With this change, the hosts will pull updates from the Quay.io container registry instead.
This is a transparent change, except for proxied environnements, as the nodes will reach to a different address for updates.
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We claim that it's transparent and then mention exceptions. Let's say that it should be transparent but the following points may require attention: proxy configuration, etc.

After a few releases, we will migrate existing nodes.

This change is only scoped to switching to OCI as the transport for Fedora CoreOS content.
While derivation of these Fedora CoreOS images is possible with containers builds and use bootc, this comes with limitations:
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Will need some rewording

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