separated components

webapp/Dockerfile

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+# syntax=docker/dockerfile:1.3-labs
+FROM ubuntu:20.04
+# install apt packages
+RUN <<EOF 
+apt-get update -y
+export DEBIAN_FRONTEND=noninteractive 
+export TZ=Europe/Berlin 
+apt-get install -y tzdata z-push apache2 wget xz-utils
+apt-get autoclean
+rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* ~/.cache ~/.npm
+EOF
+# install kopano webapp
+RUN <<EOF
+wget --no-verbose -P/tmp http://bldr/webapp-6.0.0.57.1049268-Ubuntu_20.04-all.tar.gz
+tar xzf /tmp/webapp-6.0.0.57.1049268-Ubuntu_20.04-all.tar.gz
+for F in ~/webapp-6.0.0.57.1049268-Ubuntu_20.04-all/*.deb; do dpkg --unpack --no-triggers $F; done
+apt-get install -f -y
+apt-get clean
+rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* ~/.cache ~/.npm
+rm -rf ~/webapp-6.0.0.57.1049268-Ubuntu_20.04-all
+EOF
+WORKDIR /root
+EXPOSE 80
+VOLUME /var/lib/z-push
+ENTRYPOINT ["/init"]