Agent-based installer - add static networking support for ISO_NO_REGISTRY mode

[bfournie]

Add TUI automation to configure static IPs and hostnames via nmtui for agent-based ISO_NO_REGISTRY installations. Creates a NEW NetworkManager connection (rather than editing the existing DHCP one) to ensure --copy-network is triggered by coreos-installer, preserving the static config across reboots.

See openshift/assisted-installer-agent#1374

[openshift-ci]

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[openshift-ci]

@bfournie: The following test 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	218f5e4	link	false	/test e2e-agent-5control-ipv4

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[bfournie]

This appears to work well, removing the WIP

The install was successfully

time="2026-08-03T17:18:58+02:00" level=info msg="Waiting for 5m0s ..."
time="2026-08-03T17:24:03+02:00" level=info msg="Console URL is available."
time="2026-08-03T17:24:03+02:00" level=info msg="Screenshot saved to/home/stack/dev-scripts-bfournie-latest/ocp/ostest/09-installation-progress-10.png, with type of image/png"

$ oc get nodes
NAME       STATUS   ROLES                         AGE   VERSION
master-0   Ready    control-plane,master,worker   37m   v1.36.2
master-1   Ready    control-plane,master,worker   71m   v1.36.2
master-2   Ready    control-plane,master,worker   72m   v1.36.2

And can log in via the static IP to all of the nodes

$ ssh core@192.168.111.80
Red Hat Enterprise Linux CoreOS 10.2.20260730-1
  Part of OpenShift 5.0, RHCOS is a Kubernetes-native operating system
  managed by the Machine Config Operator (`clusteroperator/machine-config`).

WARNING: Direct SSH access to machines is not recommended; instead,
make configuration changes via `machineconfig` objects:
  https://docs.openshift.com/container-platform/5.0/architecture/architecture-rhcos.html

---
Last login: Mon Aug  3 16:07:53 2026 from 192.168.111.1
[systemd]
Failed Units: 2
  NetworkManager-wait-online.service
  systemd-network-generator.service
[core@master-0 ~]$ exit
logout
Connection to 192.168.111.80 closed.
[stack@r640-u02 dev-scripts-bfournie-latest]$ ssh core@192.168.111.81
The authenticity of host '192.168.111.81 (192.168.111.81)' can't be established.
ED25519 key fingerprint is SHA256:806YjC6vkr4R/2xuwpeP3GuGAKSFQ2fVMkv6t0THmAU.
This key is not known by any other names.
Are you sure you want to continue connecting (yes/no/[fingerprint])? yes
Warning: Permanently added '192.168.111.81' (ED25519) to the list of known hosts.
Red Hat Enterprise Linux CoreOS 10.2.20260730-1
  Part of OpenShift 5.0, RHCOS is a Kubernetes-native operating system
  managed by the Machine Config Operator (`clusteroperator/machine-config`).

WARNING: Direct SSH access to machines is not recommended; instead,
make configuration changes via `machineconfig` objects: