feat: add support for datastore clusters

[tenthirtyam]

Description

Adds support for specifying a datastore_cluster (in addition to the existing datastore option) for virtual machine builds and post-processing. It ensures that datastore and datastore_cluster are mutually exclusive, updates documentation, and adjusts the build logic to handle Storage DRS recommendations for multi-disk VMs. Several steps in the build and upload process are updated to respect the resolved datastore selection.

Configuration and Validation Updates:

• Added datastore_cluster as a configuration option in builder and post-processor config structs, with validation to ensure only one of datastore or datastore_cluster is specified. [1] [2] [3] [4] [5] [6]

Documentation Improvements:

• Updated documentation for vsphere-clone, vsphere-iso, and vsphere post-processor components to describe the new datastore_cluster option, its mutual exclusivity with datastore, and Storage DRS behavior. [1] [2] [3] [4]

Build and Clone Logic Enhancements:

• Modified the VM cloning step to support disk placement recommendations from Storage DRS when a datastore_cluster is specified, including handling for multiple disks and fallback logic. [1] [2] [3] [4]
• Added a step to resolve the datastore or datastore cluster before VM creation.

Upload and Cleanup Step Adjustments:

• Updated steps for uploading and deleting files (floppy, ISO, CD, and remote cache) to use the resolved datastore from either datastore or datastore_cluster throughout the build and cleanup process. (F1d22be6L35R35, [1] [2] [3] [4] [5] [6] [7] [8]

Resolved Issues

Adds support for the use of datastore clusters in the applicable builders and post-processors.

Closes #9

Rollback Plan

Revert commit.

Changes to Security Controls

None.