[bojemoi] sec: move alertmanager SMTP password to Docker secret

Commit 8d7722b

Description

Replace plaintext smtp_auth_password with smtp_auth_password_file pointing to /run/secrets/alertmanager_smtp_pass (new external secret). Mount the secret in the alertmanager service definition.

Co-Authored-By: Claude Sonnet 4.6 noreply@anthropic.com

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