feat: add remote ovf/ova source support

[tenthirtyam]

Description

Warning

End-to-end testing is still pending.

Extends the vsphere-clone builder to support using remote OVF and OVA files as clone sources, in addition to the current support for standard virtual machine templates. Remote OVF/OVA support enables users to deploy virtual machines directly from OVF/OVA files accessible via HTTP/HTTPS URLs using vSphere's native OVF Manager capabilities available in the vmware/govmomi SDK.

It adds a new remote_source configuration block, updates documentation, and implements comprehensive validation and tests to ensure correct usage and mutual exclusivity between template and remote_source.

Resolved Issues

Closes #566

Rollback Plan

Revert commit.

Changes to Security Controls

None.

[Copilot]

Pull request overview

This PR extends the vsphere-clone builder to support deploying VMs from remote OVF/OVA files accessible via HTTP/HTTPS URLs, in addition to the existing template-based cloning. The implementation uses vSphere's native OVF Manager capabilities and includes comprehensive validation, authentication support, TLS configuration, credential sanitization, and extensive test coverage.

Key Changes:

• Adds remote_source configuration block with URL, authentication credentials, and TLS options
• Implements mutual exclusivity between template and remote_source
• Adds OVF deployment functionality in the driver layer with progress monitoring
• Includes comprehensive credential sanitization to prevent exposure in logs and error messages

Reviewed changes

Copilot reviewed 20 out of 20 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
builder/vsphere/clone/step_clone.go	Adds RemoteSourceConfig struct, OVF deployment logic, and credential sanitization
builder/vsphere/driver/driver.go	Implements OVF deployment, progress monitoring, error handling, and validation
builder/vsphere/driver/driver_mock.go	Adds mock implementations for OVF operations
builder/vsphere/driver/driver_test.go	Comprehensive tests for OVF functionality
builder/vsphere/clone/step_clone_test.go	Tests for remote source detection and deployment
builder/vsphere/clone/config.go	Updates code generation directive
docs-partials/**/*.mdx	Documentation for remote source configuration
Test files	HTTP server, integration tests, and credential handling tests

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