Added release notes and version entries for 2025.28.1

Author: GitHub Actions

website/blog/2025-07-11-Release-0.md

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+---
+author: meshcloud
+title: Release 2025.28.1
+---
+
+Release period: 2025-07-09 to 2025-07-11
+
+This release includes the following issues:
+* Building Block runners use external endpoints for callbacks
+* Fixed Adding Users During Workspace Creation
+<!--truncate-->
+
+## Ticket Details
+### Building Block runners use external endpoints for callbacks
+**Audience:** User<br>
+
+#### Description
+We fixed an issue where Building Block runners were using internal endpoints, which caused problems when integrating with 
+external systems that require callback URLs. This affected GitHub Actions, GitLab CI/CD pipelines, and asynchronous 
+Terraform runs that needed to communicate back to meshStack.
+
+### Fixed Adding Users During Workspace Creation
+**Audience:** User<br>
+
+#### Description
+This fix addresses the issue where users could not be added during workspace creation.
+