Update file Dockerfile

gitlab-ci/Dockerfile

@@ -12,7 +12,7 @@ ENV PATH="$PATH:$EXTLIB/bin"
 ENV PERL_CPANM_HOME="/cpanm/"
 
 RUN apt-get update; \
-    apt-get install -y --no-install-recommends gnupg wget; \
+    apt-get install -y --no-install-recommends gnupg wget ca-certificates; \
     wget -O - https://sdvdebianrepo.slub-dresden.de/deb-repository/pub.gpg.key | apt-key add - ; \
     echo "deb https://sdvdebianrepo.slub-dresden.de/deb-repository "${DEBIAN_RELEASE}" main" > /etc/apt/sources.list.d/slub.list;