Add a new emqx image (#10882)

Signed-off-by: zhanghongtong <[email protected]>

library/emqx

@@ -0,0 +1,8 @@
+Maintainers: Rory Z <[email protected]> (@rory-z)
+GitRepo: https://github.com/emqx/emqx-docker.git
+GitFetch: refs/heads/main
+
+Tags: 4.3.5, 4.3, 4, latest
+GitCommit: 915d12f4a289def311fdc350f85539c74068bdb9
+Directory: 4.3
+File: Dockerfile