Rm obsolete (see DPSACE_TAG) second git pull

dockerfiles/Dockerfile.dspace

@@ -92,18 +92,14 @@ COPY commul-customization/tomcat-server.xml /opt/tomcat8/conf/server.xml
 #
 # Our clarin-dspace tag to checkout
 ENV DSPACE_TAG="commul-2020.01.0-rc2_dspace-2020.02.1"
-
-# pre-fetch maven dependencies
+# clone specific version tag
 RUN git clone --depth 1 --branch "$DSPACE_TAG" --recursive https://github.com/commul/clarin-dspace.git /opt/repository/sources/dspace
 WORKDIR /opt/repository/sources/dspace
+# pre-fetch maven dependencies
 RUN mvn -B -T 1C \
     --quiet \
     --fail-never \
     dependency:copy-dependencies dependency:resolve-plugins dependency:go-offline
-#
-# 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 /tmp/version.json
-RUN git pull
 RUN mvn -B -T 1C clean compile
 
 WORKDIR /opt/repository/sources/dspace/utilities/project_helpers