Add note on mandatory extension signature verification for Linux ARM32 builds

Author: sandy081

release-notes/v1_100.md

@@ -335,6 +335,8 @@ Extension signature verification is now required on all platforms: Windows, macO
 
 This change further strengthens security by preventing the installation of potentially malicious extensions. For more information, see the [Extension Signing](https://code.visualstudio.com/docs/configure/extensions/extension-marketplace#_the-extension-signature-cannot-be-verified-by-vs-code).
 
+> **Note:** Mandatory extension signature verification remains disabled on Linux ARM32 builds due to [issue #248308](https://github.com/microsoft/vscode/issues/248308). This is expected to be resolved in the next release.
+
 ### Learn more links for malicious extensions
 
 When an extension is identified as malicious, VS Code now provides links to additional information explaining why the extension was flagged. These "Learn More" links connect users to GitHub issues or documentation with details about the security concerns, helping you better understand the potential risks.