[multipass] add custom rpios cloud init to emulate rpios64

multipass/cloud-init-rpios-like-arm64.yaml

@@ -0,0 +1,62 @@
+#cloud-config
+hostname: rpios-like-arm64
+manage_etc_hosts: true
+
+write_files:
+  - path: /usr/local/sbin/setup-raspi-repo-and-sys-mods-arm64.sh
+    permissions: "0755"
+    content: |
+      #!/usr/bin/env bash
+      set -euo pipefail
+
+      arch="$(dpkg --print-architecture)"
+      if [[ "$arch" != "arm64" ]]; then
+        echo "arm64-only; detected '$arch' -> skipping" >&2
+        exit 0
+      fi
+
+      export DEBIAN_FRONTEND=noninteractive
+
+      apt-get update
+      apt-get install -y --no-install-recommends ca-certificates curl gnupg util-linux
+
+      install -d -m 0755 /usr/share/keyrings /etc/apt/preferences.d
+
+      if [[ ! -s /usr/share/keyrings/raspberrypi-archive-keyring.gpg ]]; then
+        curl -fsSL https://archive.raspberrypi.org/debian/raspberrypi.gpg.key \
+          | gpg --dearmor -o /usr/share/keyrings/raspberrypi-archive-keyring.gpg
+        chmod 0644 /usr/share/keyrings/raspberrypi-archive-keyring.gpg
+      fi
+
+      #cat >/etc/apt/preferences.d/raspi.pref <<'EOF'
+      #Package: *
+      #Pin: origin "archive.raspberrypi.org"
+      #Pin-Priority: 100
+      #EOF
+
+      if [[ ! -f /etc/apt/sources.list.d/raspi.sources ]]; then
+        cat >/etc/apt/sources.list.d/raspi.sources <<'EOF'
+      Types: deb
+      URIs: https://archive.raspberrypi.org/debian/
+      Suites: trixie
+      Components: main
+      Signed-By: /usr/share/keyrings/raspberrypi-archive-keyring.gpg
+      EOF
+      fi
+
+      apt-get update
+
+      # Add custom /etc/rpi-issue for "rpios-like"
+      if [[ ! -s /etc/rpi-issue ]]; then
+        {
+          echo "Raspberry Pi reference trixie-latest $(date -R)"
+          echo "Emulated using debian-13-genericcloud"
+        } >/etc/rpi-issue
+      fi
+
+      echo "---- /etc/rpi-issue ----"
+      cat /etc/rpi-issue || true
+      echo "------------------------"
+
+runcmd:
+  - [ bash, -lc, "/usr/local/sbin/setup-raspi-repo-and-sys-mods-arm64.sh" ]