Add docs about docker:build network config
@@ -89,6 +89,9 @@ a| Scan the archive specified in `dockerArchive` and find the actual repository
| *maintainer*
| The author (`MAINTAINER`) field for the generated image
+| *network*
+| Set the networking mode for the RUN instructions during build
+
| *noCache*
| Don't use Docker's build cache. This can be overwritten by setting a system property `docker.noCache` when running Maven.
