Help: Add 4.2 release note for CPack AppImage generator
This was missed in commit 1a6dbcc9ea (CPack: Add AppImage generator,
2025-07-30, v4.2.0-rc1~229^2).
Issue: #27104
diff --git a/Help/release/4.2.rst b/Help/release/4.2.rst
index 5e2462c..1c41987 100644
--- a/Help/release/4.2.rst
+++ b/Help/release/4.2.rst
@@ -172,6 +172,8 @@
CPack
-----
+* The :cpack_gen:`CPack AppImage Generator` was added.
+
* The :variable:`CPACK_PACKAGE_CHECKSUM` variable now supports multiple values.
* The :cpack_gen:`CPack NSIS Generator` gained a
