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Description

Currently, if the source_name config is not provided, the Supervisor builder will use packer-vsphere-supervisor-<random-suffix> as the default source name as documented in https://developer.hashicorp.com/packer/integrations/hashicorp/vsphere/latest/components/builder/vsphere-supervisor#source-vm-creation

This is causing issues for deploying Windows VMs as they require a shorter hostname.

Use Case(s)

Provide a default source name that satisfies the Windows hostname requirement of 1 to 15 characters long.

Potential configuration

Instead of using a prefix, generate a random 4-character long name if the source_name config is not specified. This name should be generic since it's used for creating all required source objects (e.g., VM, VMService, Secret, etc.).

Potential References

Windows hostname requirement: https://learn.microsoft.com/en-us/troubleshoot/windows-server/active-directory/naming-conventions-for-computer-domain-site-ou

Current prefix code: https://github.com/hashicorp/packer-plugin-vsphere/blob/main/builder/vsphere/supervisor/step_create_source.go#L26