Add blog post for week 18

Co-authored-by: Nikola Forró <nforro@redhat.com>

Author: majamassarini

weekly/2025/week-18.md

@@ -0,0 +1,15 @@
+---
+title: Week 18 in Packit
+date: 2025-05-05
+authors: mmassari
+tags:
+  - 2025-April
+  - 2025
+  - April
+---
+
+## Week 18 (April 29th – May 5th)
+
+- Installability check is now being run as part of CI on dist-git pull requests. For more information, please refer to our [documentation](https://packit.dev/fedora-ci/jobs#installability). ([packit-service#2782](https://github.com/packit/packit-service/pull/2782))
+
+- Support for Forgejo pull requests has been added. ([ogr#925](https://github.com/packit/ogr/pull/925))