azure-arm: Add `public ip sku` parameter

[CorrenSoft]

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Description

Under certain configurations, the packer creates a Public IP to be used by the virtual machine but is always a basic SKU, and does not exist a parameter to define a different SKU. The request is to have that possibility.

Use Case(s)

As part of the process, some tools are installed and some information is retrieved from an IP-restricted site. To be able to configure an appropriate allow-list is necessary to control the outbound IP, and for that purpose, I have a NAT Gateway associated with the subnet used by Packer. The whole process fails because Azure does allow the creation of any other public IP with the Basic Sku in the same subnet as NAT Gateway.

Potential configuration

HCL

source "azure-arm" "example" {
  ...
  public_ip_sku = "Standard"
  ...
}

Potential References