SEBA-570 add backup/restore feature

Change-Id: I25987d3394e9416d9a67cc495bf8f8907ffe11a7
diff --git a/Dockerfile.core b/Dockerfile.core
index f94066a..2e5dcf5 100644
--- a/Dockerfile.core
+++ b/Dockerfile.core
@@ -17,7 +17,7 @@
 
 # Install libraries and python requirements
 COPY requirements.txt /tmp/requirements.txt
-RUN apk add --no-cache bash postgresql-dev \
+RUN apk add --no-cache bash postgresql-dev postgresql-client \
  && pip install -r /tmp/requirements.txt \
  && pip freeze > /var/xos/pip_freeze_xos-core_`date -u +%Y%m%dT%H%M%S` \
  && mkdir -p /opt/xos