Support data disk for shared image gallery transformer

[lubaihua33]

Description

Related Issue

Type of Change

• Bug fix
• New feature
• Breaking change
• Refactoring
• Documentation update

Checklist

• Description is filled in above
• No credentials, secrets, or internal details are included
• Peer review requested (if not, add required peer reviewers after raising PR)
• Tests executed and results posted below

Test Validation

Test has been passed with the following runbook:

transformer:
  - type: azure_sig
    enabled: $(enable_transformer_to_sig)
    vhd:
      vhd_path: "$(vhd_path)"
      data_vhd_paths: "$(vhd_data_path1),$(vhd_data_path2)"
    gallery_resource_group_name: $(gallery_rg_name)
    gallery_name: $(gallery_name)
    gallery_image_location:
      - $(location)
    gallery_image_hyperv_generation: $(hyperv_generation)
    gallery_image_name: $(gallery_image_name)
    gallery_image_architecture: $(gallery_image_architecture)
    gallery_image_fullname: $(gallery_image_fullname)
    gallery_image_securitytype: $(gallery_image_securitytype)
    rename:
      azure_sig_url: shared_gallery
  # This is to change vhd value to "" in case of ARM since vhd has
  # high priority than shared_gallery
  - type: script
    enabled: $(enable_transformer_to_sig)
    scripts:
      - name: vhd
        variables:
          - vhd
        script: "str('')"
    rename:
      script_vhd: vhd

Tests have been passed with the following image with data disk:
ibm-usa-ny-armonk-hq-6275750-ibmcloud-aiops 2023-03-27-twas-single-server-base-image 2023-03-27-twas-single-server-base-image 9.0.20250429

[Copilot]

Pull request overview

This PR adds support for including data disk VHDs when creating a Shared Image Gallery (SIG) image version via the azure_sig transformer, and adjusts the ARM/Bicep template to emit null for dataDisks when no data disks are specified.

Changes:

• Extend azure_sig transformer configuration to accept either a string VHD URI (back-compat) or an object that can also carry data disk VHD URIs.
• Validate existence of both OS and data disk blobs and pass data disk sources into SIG image version creation.
• Update ARM/Bicep templates so dataDisks becomes null (omitted) when data_disks is empty.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
lisa/sut_orchestrator/azure/transformers.py	Accepts structured VHD inputs (OS + data disks), resolves/copies VHD URIs, and validates blob existence before SIG creation.
lisa/sut_orchestrator/azure/common.py	Adds optional data_vhd_paths and populates storageProfile.dataDiskImages when creating a SIG image version.
lisa/sut_orchestrator/azure/autogen_arm_template.json	Emits null for dataDisks when no data disks are specified (generated output).
lisa/sut_orchestrator/azure/arm_template.bicep	Implements the conditional dataDisks: null behavior in source Bicep.

[github-actions]

✅ AI Test Selection — PASSED

1 test case(s) selected (view run)

Marketplace image: canonical 0001-com-ubuntu-server-jammy 22_04-lts-gen2 latest

	Count
✅ Passed	1
❌ Failed	0
⏭️ Skipped	0
Total	1

Test case details

Test Case	Status	Time (s)	Message
smoke_test (lisa_0_0)	✅ PASSED	35.807

[github-actions]

✅ AI Test Selection — PASSED

1 test case(s) selected (view run)

Marketplace image: canonical 0001-com-ubuntu-server-jammy 22_04-lts-gen2 latest

	Count
✅ Passed	1
❌ Failed	0
⏭️ Skipped	0
Total	1

Test case details

Test Case	Status	Time (s)	Message
smoke_test (lisa_0_0)	✅ PASSED	53.243