set emqx version to 4.3.8 rather than latest

geoff-nunan · geoff-nunan · commit 06e65b079a1c · 2021-10-08T15:44:41.000+11:00
diff --git a/Standalone/docker-compose.yml b/Standalone/docker-compose.yml
@@ -58,7 +58,7 @@ services:
       - "alpha"
       - "zero"
   mqtt:
-    image:  emqx/emqx:latest
+    image:  emqx/emqx:4.3.8
     ports:
       - 1883:1883
       - 8083:8083
