add changelog entry

Author: iostat

CHANGELOG.md

@@ -11,6 +11,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - **Node**: add top-level documentation for the crate `node`
   ([#1736](https://github.com/o1-labs/mina-rust/pull/1736))
+- **Web Node**: fix webnode build, add quality-of-life improvements when running
+  webnode in Docker. ([#1778](https://github.com/o1-labs/mina-rust/pull/1778))
 
 ### Changes