Add docker service

src/docker/constants-service.conf

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+#!/bin/bash
+
+# Authors:
+# (C) 2021 Idea an concept by Christian Zengel <christian@sysops.de>
+# (C) 2021 Script design and prototype by Markus Helmke <m.helmke@nettwarker.de>
+# (C) 2021 Script rework and documentation by Thorsten Spille <thorsten@spille-edv.de>
+
+# This file contains the project constants on service level
+
+# Debian Version, which will be installed
+LXC_TEMPLATE_VERSION="debian-12-standard"
+
+# Create sharefs mountpoint
+LXC_MP="0"
+
+# Create unprivileged container
+LXC_UNPRIVILEGED="1"
+
+# enable nesting feature
+LXC_NESTING="1"
+
+# enable keyctl feature
+LXC_KEYCTL="1"
+
+# Sets the minimum amount of RAM the service needs for operation
+LXC_MEM_MIN=2048
+
+# service dependent meta tags
+SERVICE_TAGS=""

src/docker/install-service.sh

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+#!/bin/bash
+
+# Authors:
+# (C) 2021 Idea an concept by Christian Zengel <christian@sysops.de>
+# (C) 2021 Script design and prototype by Markus Helmke <m.helmke@nettwarker.de>
+# (C) 2021 Script rework and documentation by Thorsten Spille <thorsten@spille-edv.de>
+
+# Add Docker's official GPG key:
+install -m 0755 -d /etc/apt/keyrings
+curl -fsSL https://download.docker.com/linux/debian/gpg | gpg --dearmor -o /etc/apt/keyrings/docker.gpg
+chmod a+r /etc/apt/keyrings/docker.gpg
+
+# Add the repository to Apt sources:
+echo "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/debian $(. /etc/os-release && echo "$VERSION_CODENAME") stable" | tee /etc/apt/sources.list.d/docker.list > /dev/null
+apt-get update
+DEBIAN_FRONTEND=noninteractive DEBIAN_PRIORITY=critical apt-get install -y -qq docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin