Reuse go docker build cache (#1218)

environments/jvm/builder/Dockerfile

@@ -16,7 +16,7 @@ ENV JAVA_HOME /usr/lib/jvm/java-1.8-openjdk
 ENV PATH $PATH:/usr/lib/jvm/java-1.8-openjdk/jre/bin:/usr/lib/jvm/java-1.8-openjdk/bin
 
 ENV JAVA_VERSION 8u181
-ENV JAVA_ALPINE_VERSION 8.181.13-r0
+ENV JAVA_ALPINE_VERSION 8.212.04-r0
 
 RUN set -x \
     && apk add --no-cache \
@@ -44,4 +44,4 @@ ENV MAVEN_CONFIG "$USER_HOME_DIR/.m2"
 
 ## Fission builder specific section
 ADD build.sh /usr/local/bin/build
-EXPOSE 8001
+EXPOSE 8001