Installed libsfcal1 from backports to get DB image to build

db/Dockerfile

@@ -3,7 +3,9 @@ MAINTAINER Piero Toffanin <pt@masseranolabs.com>
 
 ENV POSTGIS_MAJOR 2.3
 
-RUN apt-get update \
+RUN echo "deb http://deb.debian.org/debian jessie-backports main" >> /etc/apt/sources.list \
+	  && apt-get update \
+      && apt-get install -t jessie-backports -y --no-install-recommends libsfcgal1 \
       && apt-get install -y --no-install-recommends \
            postgresql-$PG_MAJOR-postgis-$POSTGIS_MAJOR \
            postgresql-$PG_MAJOR-postgis-$POSTGIS_MAJOR-scripts \