Refactored examples

examples/apt/apt.conf.d/99parallel-fetch

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+APT::Acquire::Queue-Mode "access";
+APT::Acquire::Retries 3;

examples/apt/preferences.d/debian-release-pinning

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+Package: *
+Pin: release a=stable
+Pin-Priority: 990
+
+Package: *
+Pin: release a=testing
+Pin-Priority: 490
+
+Package: *
+Pin: release a=unstable
+Pin-Priority: -1

examples/apt/preferences.d/firefox-pinning

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+Package: firefox
+Pin: release a=unstable
+Pin-Priority: 990

examples/apt/sources.list.d/debian-bullseye.list

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+deb http://deb.debian.org/debian/ bullseye main non-free contrib
+deb http://security.debian.org/debian-security bullseye-security main contrib non-free
+
+# bullseye-updates, previously known as 'volatile'
+deb http://deb.debian.org/debian/ bullseye-updates main contrib non-free
+
+# bullseye-backports, previously on backports.debian.org
+deb http://deb.debian.org/debian/ bullseye-backports main contrib non-free

examples/apt/sources.list.d/debian-buster.list

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+deb http://deb.debian.org/debian/ buster main non-free contrib
+
+# buster-updates, previously known as 'volatile'
+deb http://deb.debian.org/debian/ buster-updates main contrib non-free
+
+# buster-backports, previously on backports.debian.org
+deb http://deb.debian.org/debian/ buster-backports main contrib non-free

examples/apt/sources.list.d/debian-stable.list

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+deb http://deb.debian.org/debian/ stable main non-free contrib
+
+# stable-updates, previously known as 'volatile'
+deb http://deb.debian.org/debian/ stable-updates main contrib non-free

examples/apt/sources.list.d/debian-testing.list

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+deb http://deb.debian.org/debian/ testing main non-free contrib
+deb http://security.debian.org/debian-security testing-security main contrib non-free
+
+# testing-updates, previously known as 'volatile'
+deb http://deb.debian.org/debian/ testing-updates main contrib non-free

examples/apt/sources.list.d/debian-unstable.list

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+deb http://deb.debian.org/debian/ unstable main non-free contrib

examples/apt/sources.list.d/dropbox.list

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+deb [arch=i386,amd64] http://linux.dropbox.com/debian sid main

examples/cloud-init/base.yaml

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+#cloud-config
+
+# Upgrade the instance.
+# Deactivated, as this could take a long time if the image is old.
+#
+# Sources:
+# - https://cloudinit.readthedocs.io/en/latest/topics/modules.html#package-update-upgrade-install
+# - https://cloudinit.readthedocs.io/en/latest/topics/examples.html#run-apt-or-yum-upgrade
+package_upgrade: false
+package_reboot_if_required: false
+
+# Install required packages.
+# This will *always* update the list of packages, regardless of the value of the
+# 'package_update' setting.
+#
+# Sources:
+# - https://cloudinit.readthedocs.io/en/latest/topics/modules.html#package-update-upgrade-install
+# - https://cloudinit.readthedocs.io/en/latest/topics/examples.html#install-arbitrary-packages
+packages:
+  - jq
+  - nc
+  - traceroute
+  - unzip

examples/cloud-init/docker.yum.yaml

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+#cloud-config
+
+# Sources:
+# - https://github.com/trajano/terraform-docker-swarm-aws/blob/master/common.cloud-config
+
+# Add the official Docker repository.
+#
+# Got from the official installation guide at
+# https://docs.docker.com/engine/install/rhel/#install-using-the-repository :
+#   yum install -y yum-utils && \
+#   yum-config-manager --add-repo \
+#     https://download.docker.com/linux/rhel/docker-ce.repo && \
+#   cat /etc/yum.repos.d/docker-ce.repo
+#
+# Sources:
+# - https://cloudinit.readthedocs.io/en/latest/topics/modules.html#yum-add-repo
+# - https://cloudinit.readthedocs.io/en/latest/topics/examples.html#adding-a-yum-repository
+yum_repos:
+  docker-ce:
+    name: Docker CE Stable - $basearch
+    enabled: true
+    baseurl: https://download.docker.com/linux/rhel/$releasever/$basearch/stable
+    priority: 1
+    gpgcheck: true
+    gpgkey: https://download.docker.com/linux/rhel/gpg
+
+# Install required packages.
+# This will *always* update the list of packages, regardless of the value of the
+# 'package_update' setting.
+#
+# docker-ce already depends on 'docker-ce-cli' and 'containerd.io'
+#
+# Sources:
+# - https://cloudinit.readthedocs.io/en/latest/topics/modules.html#package-update-upgrade-install
+# - https://cloudinit.readthedocs.io/en/latest/topics/examples.html#install-arbitrary-packages
+packages:
+  - docker-ce
+
+# Enable and start the service after installation
+runcmd:
+  - systemctl daemon-reload
+  - systemctl enable --now docker.service