feat(changelog): add new entry

Author: Changelog bot

changelog/january2025/2025-01-16-postgresql-and-mysql-added-encryption-at-rest-general-a.mdx

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+---
+title: Encryption-at-Rest General Availability
+status: added
+author:
+    fullname: 'Join the #database channel on Slack.'
+    url: 'https://slack.scaleway.com'
+date: 2025-01-16
+category: databases
+product: postgresql-and-mysql
+---
+
+Encryption-at-rest is now GA for Managed PostgreSQL & MySQL. Refer to this [documentation](https://www.scaleway.com/en/docs/managed-databases/postgresql-and-mysql/api-cli/setting-up-encryption-at-rest/) to activate it, and analyse these [benchmarks](https://www.scaleway.com/en/docs/managed-databases/postgresql-and-mysql/reference-content/encryption-at-rest-performance-benchmark/)  to understand potential impacts on performances.
+