fix: add support for 'cvm' image SKU in packer build process

[pineapplethevoyager]

What type of PR is this?

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #

Requirements:

• uses conventional commit messages
• includes documentation
• adds unit tests
• tested upgrade from previous version

Special notes for your reviewer:

Release note:

none

[pineapplethevoyager]

Should I set SKU Name as well? (like done for 20_04-lts-cvm?

[pineapplethevoyager]

Should this install dependency change be applied to other cvms? I was able to get pipeline to build successfully without

[Devinwong]

Does IMG_SKU='cvm' specifically imply 2404cvm? If that's the case, is there any reason why it's not named as 24_04-lts-cvm. I could be wrong, but from the naming it seems 'cvm' includes all SKUs ranging from 18.04 to 24.04 CVM.

[pineapplethevoyager]

IMG_SKU is defined by ubuntu version. Currently the only sku that has img_sku == cvm is 2404.

But if the sku is CVM regardless of version it should need special cvm build that should be caught by this if sku==cvm

[Devinwong]

Should this install dependency change be applied to other cvms? I was able to get pipeline to build successfully without

I am not familiar with this either. But according to the comment, fix grub issue with cvm by reinstalling before other deps. other VHDs use grub-pc, not grub-efi. Can you double check if the image end up having the expected component installed? Seems we need to understand what is expected for 2404 cvm SKU first

[Devinwong]

Should I set SKU Name as well? (like done for 20_04-lts-cvm?

It seems it's needed, though I didn't trace how the $SKU_NAME will be used later.

[pineapplethevoyager]

Should this install dependency change be applied to other cvms? I was able to get pipeline to build successfully without

I am not familiar with this either. But according to the comment, fix grub issue with cvm by reinstalling before other deps. other VHDs use grub-pc, not grub-efi. Can you double check if the image end up having the expected component installed? Seems we need to understand what is expected for 2404 cvm SKU first

I checked release-notes and it appears no grub was installed I'll try adding this fix and see