utility image is docker free

Dockerfile.utility

@@ -4,5 +4,5 @@ RUN apt-get -qq update && \
     apt-get -qq dist-upgrade && \
     apt-get -qq install lsb-release curl wget ca-certificates locales-all python3 python3-git python3-requests git debhelper && \
     apt-get -qq clean && \
-    lsb_release -a && uname -a && python3 --version && go version
+    lsb_release -a && uname -a && python3 --version