Add disk and config support (#398)

* Disk and config support

* CI go version update

* Fix image requirements

* Refactor error messages for consistency and clarity; check config and disk coexistent requirement

* better disk and config check logic

* Require image on disk

* Add image_disk_label attribute; validate uniqueness of disk labels

* Not to require image in disk

* Refactor repetitive devices

* Unit test and some error handling fixes

* Not always set root pass

* Fix go version requirements

* Update AGENTS.md

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Remove image_disk_label and resolve the disk to be imaged from booted config

* Wrap selecting boot config function

* cleanup

* Lint

* Add notice claiming not supporting imaging volume

* generate docs

* Apply suggestion from @Copilot

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Only add SSH key to linode create options when no custom disk is configured

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: zliang-akamai

.github/workflows/ensure-docs-compiled.yaml

@@ -9,6 +9,8 @@ jobs:
       - name: Checkout 🛎
         uses: actions/checkout@v6
       - uses: actions/setup-go@v6
+        with:
+          go-version: stable
       - shell: bash
         run: make generate
       - shell: bash