Make gridUI work

cc7-base/Dockerfile

@@ -15,13 +15,19 @@ RUN yum -y install https://linuxsoft.cern.ch/wlcg/centos7/x86_64/wlcg-repo-1.0.0
     yum-config-manager --add-repo https://repository.egi.eu/sw/production/cas/1/current/repo-files/egi-trustanchors.repo && \
     yum -y clean all && rm -rf /var/cache
 
+# Install software
+RUN yum -y groupinstall 'Development Tools' && \
+    yum -y install HEP_OSlibs && \
+    yum clean all && rm -rf /var/cache
+
 # Add grid stuff
-run yum -y install HEP_OSlibs && \
-    yum -y install \
+run yum -y install \
     ca-policy-egi-core \
     ca-policy-lcg \
     gfal2-all \
     gfal2-util \
+    python3-gfal2 \
+    python3-gfal2-util \
     globus-proxy-utils \
     globus-gass-copy-progs \
     voms-clients-cpp \