[4.0] rpm-ostree 2026.1: `rpm-ostree upgrade` exits 0 without a new deployment on bootc hosts (upstream #5567, fixed in 2026.2)

Inspect the rpm-ostree spec on the 4.0 branch and compare its 2026.1 package with upstream 2026.2 and commits 242903283b and a194bf5375. Use the reported bootc host reproduction, then verify that rpm-ostree upgrade stages a changed image or prints "No upgrade available." when appropriate.

Describe the bug

Azure Linux 4.0 ships rpm-ostree-2026.1-4.azl4 (preview repo; the 4.0 branch spec is at 2026.1). On a host installed with bootc install from an Azure Linux 4.0 bootc image, rpm-ostree upgrade pulls the new container image and exits 0 without staging a deployment. It prints no message. The result is the same with and without layered packages.

This is upstream rpm-ostree issue coreos/rpm-ostree#5567, fixed by coreos/rpm-ostree#5569 (commit 242903283b, with the follow-up a194bf5375 for the "No upgrade available." message). The fix is in rpm-ostree 2026.2 and later. Version 2026.1 has an early return in deploy_transaction_execute (src/daemon/rpmostreed-transaction-types.cxx) that ignores the changed base image for container origins.

To Reproduce

1. Build a bootc image from mcr.microsoft.com/azurelinux-beta/base/core:4.0 with kernel bootc ostree bootupd rpm-ostree and the bootloader packages from the preview repo. Push it to a registry.
2. Install it with bootc install to-disk and boot the host.
3. Push a changed image under the same tag.
4. On the host run rpm-ostree upgrade.

Output:

Pulling manifest: ostree-image-signed:docker://10.0.2.2:5000/azurelinux-bootc:dev

Exit code 0. rpm-ostree status shows no new deployment. journalctl -u rpm-ostreed shows only "Fetching ostree-image-signed:docker://..." and "Txn Upgrade ... successful".

bootc upgrade on the same host stages the new image. rpm-ostree deploy sha256:<digest> and rpm-ostree rebase ostree-image-signed:docker://.../azurelinux-bootc@sha256:<digest> also work, so the pull path is fine and only the upgrade transaction is affected.

Versions: rpm-ostree-2026.1-4.azl4, bootc-1.13.0-4.azl4, ostree-2025.7-5.azl4, kernel 6.18.45-1.3.azl4, x86_64.

Expected behavior

rpm-ostree upgrade stages the new image, or prints "No upgrade available." when there is none.

Request

Update rpm-ostree to 2026.2 or later on the 4.0 branch, or backport commits 242903283b and a194bf5375 from upstream.