Walkthrough

This change removes support for CAA DNS record validation throughout the codebase. All references to the _APP_DOMAIN_TARGET_CAA and _APP_DNS environment variables are deleted from configuration files, Docker Compose files, and environment variable lists. The code responsible for CAA record validation is removed from backend logic, including certificate issuance and domain validation workflows. The DNS validator class is refactored to use native PHP DNS functions and no longer handles CAA records. Related tests and model definitions for CAA variables are also deleted or updated accordingly.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Possibly related PRs

• Check CAA record before issuing certificate #10258: Reverses the addition of CAA DNS record validation and associated environment variables, which directly relates to the removal of CAA record checks and configuration in this PR.

Suggested reviewers

• stnguyen90

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