docs: document role parameters in README.md [citest_skip]

[richm]

document role parameters in README.md

Signed-off-by: Rich Megginson rmeggins@redhat.com

Summary by Sourcery

Documentation:

• Add detailed documentation for all trustee client role variables, including behavior, defaults, and types, and relocate existing secure logging variable docs into this new section.

[sourcery-ai]

Reviewer's Guide

Documents all role variables for the trustee_client Ansible role in README, including defaults, behavior, and types, and moves the secure logging variable docs into a consolidated Variables section.

File-Level Changes

Change	Details	Files
Document all trustee_client role variables in a new README "Variables" section, clarifying behavior, defaults, and types.	Add a Variables section describing trustee_client_trustee_gc behavior and its interaction with secret registration. Document KBS-related variables (trustee_client_kbs_url, trustee_client_kbs_cert_content, trustee_client_kbs_cert_src), including how they update config.toml and certificates. Document secret registration and disk encryption variables (trustee_client_secret_registration_enabled, trustee_client_encrypt_disk, trustee_client_encrypt_disk_mount_point) and their default behaviors. Move trustee_client_secure_logging documentation from its own section into the consolidated Variables section and remove the old standalone section.	README.md

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