separated components

core/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 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
+ADD https://github.com/just-containers/s6-overlay/releases/download/v3.1.1.2/s6-overlay-x86_64.tar.xz /tmp
+RUN <<EOF 
+tar -C / -Jxpf /tmp/s6-overlay-noarch.tar.xz
+tar -C / -Jxpf /tmp/s6-overlay-x86_64.tar.xz
+EOF
+COPY ./etc/s6-overlay /etc/s6-overlay
+# install kopano core
+RUN <<EOF
+wget --no-verbose -P/tmp http://bldr/core-11.0.2.50.507cbae-Ubuntu_20.04-amd64.tar.gz 
+tar xzf /tmp/core-11.0.2.50.507cbae-Ubuntu_20.04-amd64.tar.gz
+for F in ~/core-11.0.2.50.507cbae-Ubuntu_20.04-amd64/*.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 ~/core-11.0.2.50.507cbae-Ubuntu_20.04-amd64
+EOF
+# https://documentation.kopano.io/kopanocore_administrator_manual/configure_kc_components.html#configure-kopano-dagent-for-delivery-via-unix-socket
+WORKDIR /root
+EXPOSE 8443
+VOLUME /var/lib/kopano/attachments
+ENTRYPOINT ["/init"]