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Introduce the DOCKER_DISABLE_WEAK_CIPHERS environment variable to allow disabling weak TLS ciphers. When set to true, the daemon restricts TLS to a modern, secure subset of cipher suites, disabling known weak ciphers such as CBC-mode ciphers. This is intended as an edge-case option and is not exposed via a CLI flag or config option. By default, weak ciphers remain enabled for backward compatibility. Signed-off-by: Sopho Merkviladze <smerkviladze@mirantis.com>