Created Init-Container that pulls pubkeys from git, creates authorized_keys, ssh-host-keys and backup-repo folders

server/Dockerfile

@@ -0,0 +1,36 @@
+############################################################
+# Dockerfile to build borgbackup server images
+# Based on Debian
+############################################################
+FROM debian:buster-slim
+
+# Volume for SSH-Host-Keys
+VOLUME /sshkeys
+
+# Volume for borg repositories
+VOLUME /backup
+
+# Volume for authorized_keys exchange from init
+VOLUME /home/borg
+
+RUN export DEBIAN_FRONTEND=noninteractive && \
+		apt-get update && \
+		apt-get -y --no-install-recommends install \
+		borgbackup openssh-server iputils-ping && \
+		apt-get clean && \
+		useradd -s /bin/bash -m -U borg && \
+		mkdir /home/borg/.ssh && \
+		chmod 700 /home/borg/.ssh && \
+		touch /home/borg/.ssh/authorized_keys && \
+		chown -R borg:borg /home/borg /backup && \
+		mkdir /run/sshd && \
+		rm -f /etc/ssh/ssh_host*key* && \
+		rm -rf /var/lib/apt/lists/* /var/tmp/* /tmp/*
+
+COPY ./entrypoint.sh /entrypoint.sh
+COPY ./sshd_config /etc/ssh/sshd_config
+
+USER borg
+EXPOSE 2222
+
+ENTRYPOINT /entrypoint.sh