Add missing secret versions

.env.sample

@@ -9,7 +9,11 @@ DOMAIN=ghost.example.com
 #EXTRA_DOMAINS=', `www.ghost.example.com`'
 LETS_ENCRYPT_ENV=production
 
-## Mail settings
+SECRET_DB_PASSWORD_VERSION=v1
+
+SECRET_SMTP_PASSWORD_VERSION=v1
+
+## Mail settings (mandatory)
 #MAIL_TRANSPORT=smtp
 #MAIL_FROM=admin@example.com
 #MAIL_OPTIONS_HOST=mail.example.com