HADOOP-18769. Upgrade hadoop3 docker scripts to use 3.3.6. (#5781)

diff --git a/Dockerfile b/Dockerfile
index fa615cb..69eb1f5 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -14,7 +14,7 @@
 # limitations under the License.
 
 FROM apache/hadoop-runner
-ARG HADOOP_URL=https://dlcdn.apache.org/hadoop/common/hadoop-3.3.5/hadoop-3.3.5.tar.gz
+ARG HADOOP_URL=https://dlcdn.apache.org/hadoop/common/hadoop-3.3.6/hadoop-3.3.6.tar.gz
 WORKDIR /opt
 RUN sudo rm -rf /opt/hadoop && curl -LSs -o hadoop.tar.gz $HADOOP_URL && tar zxf hadoop.tar.gz && rm hadoop.tar.gz && mv hadoop* hadoop && rm -rf /opt/hadoop/share/doc
 WORKDIR /opt/hadoop
diff --git a/build.sh b/build.sh
index 177cfec..e1c128d 100755
--- a/build.sh
+++ b/build.sh
@@ -24,4 +24,4 @@
 	cd -
 fi
 java -jar $DIR/build/apache-rat-0.15/apache-rat-0.15.jar $DIR -e public -e apache-rat-0.15 -e .git -e .gitignore
-docker build -t apache/hadoop:3 -t apache/hadoop:3.3 -t apache/hadoop:3.3.5 .
+docker build -t apache/hadoop:3 .