separated components

kopano.dockerfile

@@ -7,6 +7,7 @@ export DEBIAN_FRONTEND=noninteractive
 export TZ=Europe/Berlin 
 apt-get install -y tzdata z-push apache2 postfix spampd wget xz-utils
 apt-get autoclean
+rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* ~/.cache ~/.npm
 EOF
 # install s6 process manager
 ADD https://github.com/just-containers/s6-overlay/releases/download/v3.1.1.2/s6-overlay-noarch.tar.xz /tmp