AGENT-1581: For ABI allow pre-built OVE ISO via AGENT_OVE_ISO_SOURCE

[bfournie]

When AGENT_E2E_TEST_BOOT_MODE=ISO_NO_REGISTRY, add an optional AGENT_OVE_ISO_SOURCE setting that lets the user supply a pre-built agent-ove ISO instead of building one locally. When set, the local build (create_agent_iso_no_registry) and its build-only cleanup steps are skipped, and the ISO is obtained from the source into the expected asset directory.

AGENT_OVE_ISO_SOURCE accepts one of:

• a quay.io/redhat-user-workloads/... container image ref (ISO extracted from the image via podman create/cp)
• a local path/filename to an already-downloaded ISO

[openshift-ci]

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[bfournie]

/cc @andfasano @pawanpinjarkar

[bfournie]

Successfully installed using Konflux storage
export AGENT_OVE_ISO_SOURCE=quay.io/redhat-user-workloads/ocp-art-tenant/art-agent-installer-iso@sha256:8d8e1cb2f9eedc5be5a5f7910286a9f99a068a833d7d8d2919715a17d96505c3

$ oc get nodes
NAME       STATUS   ROLES                         AGE   VERSION
master-0   Ready    control-plane,master,worker   18m   v1.35.6
master-1   Ready    control-plane,master,worker   64m   v1.35.6
master-2   Ready    control-plane,master,worker   64m   v1.35.6
$ oc get clusterversion
NAME      VERSION   AVAILABLE   PROGRESSING   SINCE   STATUS
version   4.22.9    True        False         9m55s   Cluster version is 4.22.9

[openshift-ci]

@bfournie: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/e2e-agent-5control-ipv4	3f30abc	link	false	/test e2e-agent-5control-ipv4
ci/prow/e2e-metal-ovn-arbiter	3f30abc	link	false	/test e2e-metal-ovn-arbiter
ci/prow/e2e-agent-compact-ipv4-iso-no-registry	3f30abc	link	false	/test e2e-agent-compact-ipv4-iso-no-registry

Full PR test history. Your PR dashboard.

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