Add Cereal to docker image

Cereal is a C++ based serialization library that can be used by
applications to serialize objects.

Change-Id: I15d3ec3fb471e7da4abcd12b37097193811f1dcd
Signed-off-by: Deepak Kodihalli <dkodihal@in.ibm.com>
diff --git a/build-unit-test-docker.sh b/build-unit-test-docker.sh
index 014c885..c2f8275 100755
--- a/build-unit-test-docker.sh
+++ b/build-unit-test-docker.sh
@@ -84,6 +84,10 @@
 cp -a googlemock/libgmock.so /usr/lib/ && \
 cp -a googlemock/libgmock_main.so /usr/lib/
 
+RUN wget https://github.com/USCiLab/cereal/archive/v1.2.2.tar.gz
+RUN tar -xzf v1.2.2.tar.gz
+RUN cp -a cereal-1.2.2/include/cereal/ /usr/include/
+
 RUN grep -q ${GROUPS} /etc/group || groupadd -g ${GROUPS} ${USER}
 RUN grep -q ${UID} /etc/passwd || useradd -d ${HOME} -m -u ${UID} -g ${GROUPS} ${USER}