microshift-image: create a booc microshift based image

[mangelajo]

Summary by CodeRabbit

• New Features

  • Web-based configuration UI served on port 8880 with auth, forced password change, kubeconfig download, live system/MicroShift stats, and management APIs
  • End-to-end boot image workflow: build/push multi-arch images, QCOW2/ISO generation, and container lifecycle/run helpers; runtime services for the config UI and banner

• Documentation

  • Added comprehensive deployment and config-service READMEs with quick start, build/run, customization, and troubleshooting

• Chores

  • Default boot configuration updated (locale, keyboard, LVM layout) and default root password set to "jumpstarter"

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