fixed problem with perl module by disabling tests during install

dockerfiles/Dockerfile.nginx

@@ -8,9 +8,10 @@ LABEL maintainer="Alexander König <Alexander.Koenig@eurac.edu>"
 
 # install cpanm and dependencies
 RUN apt-get update \
+&&  apt-get -y upgrade \
 &&  apt-get -y install make gcc wget cpanminus
 
-RUN cpanm File::Spec::Functions
+RUN cpanm -n File::Spec::Functions
 RUN cpanm Term::ReadLine
 
 # install jdk, ant, psql, mvn, make, libxml, xsltproc, zip, wget