Increase parallelism

.gitlab-ci.yml

@@ -35,7 +35,7 @@ compile:
   stage: build
   script:
     - go get github.com/mitchellh/gox
-    - gox -output="builds/{{.Dir}}_{{.OS}}_{{.Arch}}"
+    - gox -output="builds/{{.Dir}}_{{.OS}}_{{.Arch}}" -parallel=4
   artifacts:
     paths:
       - builds/