added prefetching of maven dependencies (cf. #11)

dockerfiles/Dockerfile.dspace

@@ -51,6 +51,10 @@ COPY commul-customization/tomcat-server.xml /opt/tomcat8/conf/server.xml
 
 
 # install Dspace
+# pre-fetch maven dependencies
+COPY commul-customization/dspace-pom.xml /tmp/pom.xml
+WORKDIR /tmp/
+RUN mvn dependency:resolve
 # all files could be copied into a /tmp folder within the container first (maybe that could be mounted?); see also dspace-entrypoint.sh
 # this checks if there was a new commit since the last build
 ADD https://api.github.com/repos/commul/clarin-dspace/git/refs/heads/commul-custom version.json