changed Dockerfile to pre-fetch maven dependencies to reduce build time

dockerfiles/Dockerfile.dspace

@@ -52,14 +52,17 @@ 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
-RUN mvn -B -T 4 dependency:copy-dependencies dependency:resolve-plugins dependency:go-offline  clean
+RUN git clone https://github.com/commul/clarin-dspace.git -b commul-custom /opt/repository/sources/dspace
+WORKDIR /opt/repository/sources/dspace
+RUN mvn compile
+#COPY commul-customization/dspace-pom.xml /tmp/pom.xml
+#WORKDIR /tmp/
+## RUN mvn dependency:resolve
+#RUN mvn -B -T 4 dependency:copy-dependencies dependency:resolve-plugins dependency:go-offline  clean
 # 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
-RUN git clone https://github.com/commul/clarin-dspace.git -b commul-custom /opt/repository/sources/dspace
+ADD https://api.github.com/repos/commul/clarin-dspace/git/refs/heads/commul-custom /tmp/version.json
+RUN git pull
 WORKDIR /opt/repository/sources/dspace/utilities/project_helpers
 RUN ./setup.sh /opt/repository/workspace
 COPY commul-customization/variable.makefile /opt/repository/workspace/config/variable.makefile