Update FAQ.md

FAQ.md

@@ -81,6 +81,7 @@ You should use a secret/key management system for all secrets, e.g. [SoM Vault](
 
 If you do want to use GitLab repo for secrets:
  * Use [git-crypt](https://github.com/AGWA/git-crypt) to protect the secrets.
+ * Protect and discover secrets in your repos by using [Gitleaks](https://github.com/gitleaks/gitleaks)
  * You are on your own.
 
 ## <a name="usage-limits"></a>What are GitLab usage limits?