feat(templates): add AL2023 2025-12-08's image

This commit adds a simple template for the Amazon Linux 2023 operating
system's 2025-12-08 version. The OS is scheduled to release every two weeks,
therefore, a new script called hack/update-template-amazonlinux-2023.sh
is added next to the other template updater scripts.

Find the latest images here:
cdn.amazonlinux.com/al2023/os-images/latest/

This patch:
- Adds amazonlinux-2023 template with 2025-12-08 release by default
  (fallback).
- Resolves mount issues on AL2023 with host OS.
- Introduces a script on VM init where it updates the system to latest
release.
- Adds update-template-amazonlinux-2023.sh script to help maintainers
automatically update the verison.

Signed-off-by: Gyokhan Kochmarla <[email protected]>

Author: electricalgorithm

hack/update-template-amazonlinux-2023.sh

@@ -0,0 +1,52 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+SETUP_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+TEMPLATE_FILE="${SETUP_DIR}/../templates/experimental/amazonlinux-2023.yaml"
+
+# Get the latest release version from the CDN redirect
+distribution_release_al2023=$(basename "$(curl -Ls -o /dev/null -w %{url_effective} https://cdn.amazonlinux.com/al2023/os-images/latest/)")
+
+echo "Latest Release: ${distribution_release_al2023}"
+
+# Function to get URL and Digest
+function get_image_details() {
+	local arch="$1"
+	local folder="$2" # kvm or kvm-arm64
+	local base_url="https://cdn.amazonlinux.com/al2023/os-images/${distribution_release_al2023}/${folder}"
+	
+	local checksums
+	checksums=$(curl -Ls "${base_url}/SHA256SUMS")
+	
+	local filename
+	filename=$(echo "${checksums}" | awk '{print $2}')
+	local digest
+	digest=$(echo "${checksums}" | awk '{print $1}')
+	
+	echo "${base_url}/${filename} ${digest}"
+}
+
+# Get x86_64 details
+read -r url_amd64 digest_amd64 <<< "$(get_image_details "x86_64" "kvm")"
+echo "x86_64: ${url_amd64} ${digest_amd64}"
+
+# Get aarch64 details
+read -r url_arm64 digest_arm64 <<< "$(get_image_details "aarch64" "kvm-arm64")"
+echo "aarch64: ${url_arm64} ${digest_arm64}"
+
+sed -i.bak \
+    -e "s|location: \".*kvm/.*\"|location: \"${url_amd64}\"|" \
+    -e "/arch: \"x86_64\"/{n;s|digest: \".*\"|digest: \"sha256:${digest_amd64}\"|;}" \
+    -e "s|location: \".*kvm-arm64/.*\"|location: \"${url_arm64}\"|" \
+    -e "/arch: \"aarch64\"/{n;s|digest: \".*\"|digest: \"sha256:${digest_arm64}\"|;}" \
+    "${TEMPLATE_FILE}"
+
+# Update message
+sed -i.bak \
+    -e "s|Amazon Linux 2023 (.*)|Amazon Linux 2023 (${distribution_release_al2023})|" \
+    "${TEMPLATE_FILE}"
+
+rm "${TEMPLATE_FILE}.bak"
+
+echo "Updated ${TEMPLATE_FILE}"

templates/experimental/amazonlinux-2023.yaml

@@ -0,0 +1,58 @@
+minimumLimaVersion: 2.0.0
+
+
+
+images:
+- location: "https://cdn.amazonlinux.com/al2023/os-images/2023.9.20251208.0/kvm/al2023-kvm-2023.9.20251208.0-kernel-6.1-x86_64.xfs.gpt.qcow2"
+  arch: "x86_64"
+  digest: "sha256:c91f244483d9a460869738f7fcfb5e37eb402aec8582d10456cf0c108e1a4d4c"
+- location: "https://cdn.amazonlinux.com/al2023/os-images/2023.9.20251208.0/kvm-arm64/al2023-kvm-2023.9.20251208.0-kernel-6.1-arm64.xfs.gpt.qcow2"
+  arch: "aarch64"
+  digest: "sha256:7aef1f189076a0416cd16062bbf7e0928d81061e68411cab8904447e1bd5eafd"
+
+
+# Do not install containerd by default.
+containerd:
+  system: false
+  user: false
+
+provision:
+- mode: system
+  script: |
+    #!/bin/bash
+    set -eux -o pipefail
+    
+    # Amazon Linux 2023 missing mount.virtiofs and has tag issues
+    if [ ! -e /sbin/mount.virtiofs ]; then
+      echo '#!/bin/sh' > /sbin/mount.virtiofs
+      echo 'exec mount -i -t virtiofs "$@"' >> /sbin/mount.virtiofs
+      chmod +x /sbin/mount.virtiofs
+    fi
+ 
+    # Lima seemingly uses 'mount0' tag on this setup but Guest Agent expects path.
+    MOUNT_POINT="/mnt/host"
+    
+    if ! mountpoint -q "${MOUNT_POINT}"; then
+      mkdir -p "${MOUNT_POINT}"
+      mount -t virtiofs mount0 "${MOUNT_POINT}" || true
+    fi
+- mode: system
+  script: |
+    #!/bin/bash
+    set -eux -o pipefail
+    # Update to the latest release on the first boot
+    if [ ! -f /etc/lima-al2023-updated ]; then
+      dnf upgrade -y --releasever=latest
+    fi
+
+mounts:
+- location: "~"
+  mountPoint: "/mnt/host"
+
+message: |
+  ####################################################
+  Amazon Linux 2023 (2023.9.20251208.0)
+
+  To update the latest Amazon Linux 2023 release, run:
+  $ sudo dnf upgrade --releasever=latest
+  ####################################################