* image-builder: add Ubuntu 26.04 image
Signed-off-by: Kay Yan <kay.yan@daocloud.io>
* CI: add Ubuntu 26.04 support
Add an Ubuntu 26.04 CI job (ubuntu26-calico-all-in-one) to the main PR
matrix, OS-specific node vars, and update the coverage docs.
The VM image is published as quay.io/kubespray/vm-ubuntu-2604.
Signed-off-by: Kay Yan <kay.yan@daocloud.io>
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Signed-off-by: Kay Yan <kay.yan@daocloud.io>