[#152] modify pinpoint-flink-job.jar just one time when the container is created

pinpoint-flink/docker-bin/docker-entrypoint.sh

@@ -2,6 +2,7 @@
 
 # In flink version < 1.11 we can't use "job cluster" because it's not yet available
 if [ "$1" = "standalone-job" ]; then
+  if [ -e /build/pinpoint-flink-job.jar ]; then
     cd /build
     zip -d pinpoint-flink-job.jar "profiles/release/*.properties"
     sed -i -e "s/#PINPOINT_ZOOKEEPER_ADDRESS#/${PINPOINT_ZOOKEEPER_ADDRESS}/g" profiles/release/*
@@ -9,6 +10,7 @@ if [ "$1" = "standalone-job" ]; then
     cd -
 
     mv /build/pinpoint-flink-job.jar pinpoint-flink-job.jar
+  fi
   
   shift