docs: add a Terraform deployment example

[jeffatgametime]

Problem

Open Trove documents S3 configuration and container deployment, but operators do not have a complete infrastructure-as-code example showing the minimum AWS resources and permissions needed for a durable deployment.

Proposed behavior

Add a self-contained example under examples/terraform/aws that:

• provisions a private S3 artifact bucket with encryption, versioning, and public-access blocking
• defines least-privilege read/write permissions for the Open Trove workload
• runs the published image by immutable digest with TROVE_CONFIG_YAML
• exposes outputs and a teardown path
• clearly separates portable application configuration from environment-specific networking, DNS, and authentication policy

Validate formatting and configuration in CI without requiring live AWS credentials.

Alternatives considered

A bucket-only snippet is smaller but does not demonstrate how storage credentials, configuration, and the released container fit together.

Compatibility impact

Documentation/example only. It must consume the public image and configuration contract without introducing AWS-specific behavior into the application.