Add example configurations for Raspberry Pis

Add example configurations for Debian 11 (bullseye) on a Raspberry Pi 3
and Raspberry Pi Zero W. These configurations contain a minimal Debian
systems without a desktop. It can be used as basis to build bigger
images.

Signed-off-by: Benjamin Drung <[email protected]>

examples/Debian-bullseye-RaspberryPi3.yaml

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+---
+# Combine this configuration with Debian-bullseye.yaml for a working golden image.
+mmdebstrap:
+  architectures:
+    - arm64
+  components:
+    - contrib
+    - non-free
+  customize-hooks:
+    # Network: Use DHCP on the Ethernet interface
+    - printf "\nauto lo\niface lo inet loopback\n\nallow-hotplug eth0\niface eth0 inet dhcp\n"
+      >> "$1/etc/network/interfaces"
+  packages:
+    # Raspberry Pi 3 specific
+    - firmware-brcm80211  # contains /lib/firmware/brcm/brcmfmac43430-sdio.bin (required for WiFi)
+    - linux-image-arm64
+    - raspi-firmware

examples/Debian-bullseye-RaspberryPiZeroW.yaml

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+---
+# Combine this configuration with Debian-bullseye.yaml for a working golden image.
+mmdebstrap:
+  architectures:
+    - armel
+  components:
+    - contrib
+    - non-free
+  packages:
+    # Raspberry Pi Zero W specific
+    - firmware-brcm80211  # contains /lib/firmware/brcm/brcmfmac43430-sdio.bin (required for WiFi)
+    - linux-image-rpi
+    - raspi-firmware

examples/Debian-bullseye.yaml

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+---
+mmdebstrap:
+  cleanup-hooks:
+    - cp /dev/null "$1/etc/hostname"
+    - if test -f "$1/etc/resolv.conf"; then cp /dev/null "$1/etc/resolv.conf"; fi
+  components:
+    - main
+  customize-hooks:
+    # Update APT cache to update command-not-found database
+    - chroot "$1" apt-get update
+  keyrings:
+    - /usr/share/keyrings/debian-archive-keyring.gpg
+  mode: unshare
+  packages:
+    # install packages from priority important (aptitude search '~pimportant' -F'%p')
+    - adduser
+    - debian-archive-keyring
+    - fdisk
+    - gpgv
+    - ifupdown
+    - init
+    - iproute2
+    - iputils-ping
+    - isc-dhcp-client
+    - kmod
+    - less
+    - logrotate
+    - nano
+    - netbase
+    - procps
+    - rsyslog
+    - sensible-utils
+    - udev
+    - whiptail
+    # install packages from priority standard (aptitude search '~pstandard' -F'%p')
+    - bash-completion
+    - bind9-dnsutils
+    - bind9-host
+    - dbus
+    - file
+    - libpam-systemd  # recommended by systemd and needed to not run into https://bugs.debian.org/751636
+    - locales
+    - lsof
+    - man-db
+    - manpages
+    - openssh-client
+    - pciutils
+    - traceroute
+    - wget
+    - xz-utils
+    # basic stuff
+    - command-not-found
+    - console-data
+    - htop
+    - kbd  # for loadkeys
+    - openssh-server
+    - psmisc  # for fuser, killall, etc.
+    - rsync
+    - sudo
+    - usbutils  # for lsusb
+    - vim
+    - wireless-tools
+    - wpasupplicant
+  suite: bullseye
+  target: root.tar.xz
+  variant: minbase