Upgrade packages, remove varnishevent and varnish-headers

container/Dockerfile.klarlack

-FROM ubuntu:18.04
+FROM ubuntu:bionic-20200403
 
 RUN apt-get update
-RUN apt-get install -y curl
+RUN apt-get upgrade
+RUN apt-get install -y curl gnupg
 # install varnish repo
-RUN curl -s https://packagecloud.io/install/repositories/varnishcache/varnish63/script.deb.sh | bash
-RUN apt-get install -y varnish-dev=6.3.2-1~bionic
 
 # add uplex repodownloag gpg and import
 RUN echo "deb https://pkg.uplex.de/dpkg bionic innovation" | tee -a /etc/apt/sources.list
@@ -12,6 +11,7 @@ RUN curl -L https://pkg.uplex.de/dpkg/uplex-varnish.gpg.key | apt-key add -
 RUN apt-get clean
 RUN apt-get update
 
+RUN apt-get install -y varnish varnish-dev
 RUN apt-get install -y dcs-classifier \
     libvfp-brotli \
     libvmod-all-healthy \
@@ -29,8 +29,6 @@ RUN apt-get install -y dcs-classifier \
     libvmod-re \
     libvmod-re2 \
     libvmod-xcounter \
-    varnishevent \
-    varnish-headers \
     varnish-modules \
     varnish-objvar