[Modules] VirtualMachineImages/Images template - adding named Staging Resource Group VM User-Assigned Ids and SIG Image parameters

[shawntmeyer]

Description

Responding to Issues #2505 and #2511. Updated VirtualMachineImages/Images template (Azure VM Image Builder template) to the latest API to include the new capability for a named staging resource group. By naming a staging resource group we can avoid issues with Azure Policies that prevent storage accounts and key vaults without Private Endpoints by creating a permanent exclusion for the named resource group. NOTE: At the moment, the staging group must not exist or the image template will be stuck in creating.

This update also includes the ability to assign user assigned identities to the build VM for accessing storage accounts and key vaults during the image build process from customization scripts. This differs from the User Assigned Identity used by the image builder service which is used to create the resources necessary to build the VM.

Finally, for the Shared Image Gallery (Azure Compute Gallery) distributor object, you can now specify an explicit image version, exclude the image version from the latest, and also specify the type of storage account used to store the image version.

Type of Change

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)
• Update to documentation

Checklist

• I'm sure there are no other open Pull Requests for the same update/change
• My corresponding pipelines / checks run clean and green without any errors or warnings
• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (readme)
• I did format my code

[shawntmeyer]

Doing this now. The two PRs are needed for the AVD Accelerator updates so dual impact.

[shawntmeyer]

Please hold off on this PR for a little while today. Have one other property to add to the Image Template after talking to the AVD Accelerator team. Easy update, would like to get it in this PR.

[AlexanderSehr]

Blocking comment to wait for @shawntmeyer's extra property

[shawntmeyer]

Blocking comment to wait for @shawntmeyer's extra property

I've added the parameters and properties to the SharedImageGallery distributor object and tested in my fork/branch.