Add NVMe support to Alicloud infrastructure configuration

[Ivaylogi98]

NOTE: this repository uses a "Merge Forward" strategy

Add nvme_support cloud property for AliCloud stemcells

AliCloud instance families (c9i, g9i, r9i) require stemcell images to have Features.NvmeSupport=supported set in ECS. Previously the CPI was enabling this unconditionally for all AliCloud stemcells, which couples infrastructure-specific behaviour to the CPI rather than to the stemcell definition.

This change adds "nvme_support": "supported" to Alicloud#additional_cloud_properties in the infrastructure definition. The value is written into cloud_properties in stemcell.MF at build time, alongside the existing root_device_name property. CPIs can read this field to decide whether to enable NVMe support when importing or copying a stemcell image, rather than inferring it from the infrastructure name.

No other infrastructure is affected.

Changes

• bosh-stemcell/lib/bosh/stemcell/infrastructure.rb — added "nvme_support" => "supported" to Alicloud#additional_cloud_properties
• bosh-stemcell/spec/bosh/stemcell/infrastructure_spec.rb — added missing describe Infrastructure::Alicloud block with nvme_support assertion (the AliCloud infrastructure had no unit tests before this change)

[coderabbitai]

Walkthrough

This pull request extends the Alicloud infrastructure configuration by adding an nvme_support property set to "supported" in the additional_cloud_properties method. The implementation change returns a hash with both the existing root_device_name and the new nvme_support key. Corresponding test coverage validates that the Alicloud infrastructure correctly reports this property alongside other infrastructure attributes.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately and concisely describes the main change: adding NVMe support to the Alicloud infrastructure configuration.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description check	✅ Passed	The pull request description comprehensively explains the purpose, context, changes, and rationale for adding nvme_support to Alicloud infrastructure configuration.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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