start of combining my rpi4 resources

rpi/bootstrap.md

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+This is the cloud-init file that can be used in the 20.10 raspi image
+
+The image was originally mounted using
+
+    mkdir mnt
+    sudo mount -o loop,offset=1048576 ubuntu-20.10-preinstalled-server-arm64+raspi.img mnt
+
+Then copy `mnt/user-data` with the contents from this snippet, i.e.
+
+    cp user-data.yaml mnt/user-data
+
+Unmount the folder
+
+    umount mnt
+
+Now write to the sdcard, in my example below `/dev/sda` is the sdcard
+
+    sudo dd if=ubuntu-20.10-preinstalled-server-arm64+raspi.img of=/dev/sda bs=4M conv=fsync

rpi/user-data.yaml

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+#cloud-config
+
+ssh_import_id:
+ - lp:arif-ali
+
+## Update apt database and upgrade packages on first boot
+package_update: true
+package_upgrade: true
+
+byobu_by_default: enable
+
+## Install additional packages on first boot
+packages:
+  - aptitude
+  - byobu
+  - git
+  - linux-modules-extra-raspi
+  - nano
+  - openssh-server
+  - rpi-eeprom
+  - rsync
+  - salt-minion
+  - snapd
+  - ubuntu-minimal
+  - ubuntu-release-upgrader-core
+
+## Write arbitrary files to the file-system (including binaries!)
+write_files:
+  - path: /root/reset.sh
+    content: |
+      #!/bin/bash
+
+      export DEBIAN_FRONTEND=noninteractive
+      export APT_LISTCHANGES_FRONTEND=none
+
+      hold_apps="byobu git linux-modules-extra-raspi nano openssh-server rpi-eeprom rsync salt-minion snapd ubuntu-release-upgrader-core"
+
+      sudo -E apt-get update
+      sudo -E aptitude markauto '~i!~nubuntu-minimal'
+      sudo -E apt-mark hold ${hold_apps}
+      sudo -E apt-get -yq autoremove
+      dpkg -l | grep ^rc | awk '{print $2}' | xargs -i sudo -E dpkg --force-all -P "{}"
+      sudo -E apt-mark unhold ${hold_apps}
+      sudo -E apt-get -y install ${hold_apps}
+      sudo -E apt-get update
+      sudo -E apt-get -y upgrade
+      #sudo -E salt-call state.highstate
+    permissions: '0755'
+    owner: root:root
+
+# Configure salt
+salt_minion:
+  grains:
+    physical_type: rpi
+
+# Runs any command that we need to run post install
+runcmd:
+  - [ /root/reset.sh ]
+  - [ "snap", "set", "lxd", "criu.enable=true" ]
+
+# Creates a 8GB swap file in /
+swap:
+  filename: /swap.img
+  size: 8589934592