Add initrd generation and fix duplicate image shipping

Co-authored-by: johndoe6345789 <224850594+johndoe6345789@users.noreply.github.com>

scripts/docker-image-download-kernel.sh

@@ -8,6 +8,10 @@ echo "=== Downloading Linux kernel from Ubuntu repositories ==="
 mkdir -p /kernel
 apt-get update
 
+# Install initramfs-tools for generating initrd
+echo "Installing initramfs-tools..."
+apt-get install -y initramfs-tools
+
 # Get the actual kernel package name (not the metapackage)
 echo "Finding latest kernel package..."
 KERNEL_PKG=$(apt-cache depends linux-image-generic | grep -E 'Depends.*linux-image-[0-9]' | head -1 | awk '{print $2}')
@@ -20,7 +24,7 @@ fi
 echo "Downloading kernel package: $KERNEL_PKG"
 apt-get download "$KERNEL_PKG"
 
-# Extract the kernel package
+# Extract the kernel package to /kernel
 echo "Extracting kernel..."
 dpkg -x ${KERNEL_PKG}*.deb /kernel
 
@@ -37,6 +41,30 @@ if [ -z "$KERNEL_FILE" ]; then
 fi
 
 echo "Kernel extracted successfully: $KERNEL_FILE"
+
+# Extract kernel version from the kernel filename
+KERNEL_VERSION=$(basename $KERNEL_FILE | sed 's/vmlinuz-//')
+echo "Kernel version: $KERNEL_VERSION"
+
+# Copy kernel modules to system location so mkinitramfs can find them
+echo "Copying kernel modules to system location..."
+if [ -d /kernel/lib/modules/${KERNEL_VERSION} ]; then
+    cp -r /kernel/lib/modules/${KERNEL_VERSION} /lib/modules/
+else
+    echo "WARNING: No modules found for kernel ${KERNEL_VERSION}"
+fi
+
+# Generate initrd using mkinitramfs
+echo "Generating initrd for kernel version $KERNEL_VERSION..."
+mkinitramfs -o /kernel/boot/initrd.img-${KERNEL_VERSION} ${KERNEL_VERSION}
+
+# Verify initrd was created
+if [ ! -f /kernel/boot/initrd.img-${KERNEL_VERSION} ]; then
+    echo "ERROR: Failed to generate initrd"
+    exit 1
+fi
+
+echo "Initrd generated successfully: /kernel/boot/initrd.img-${KERNEL_VERSION}"
 ls -lh /kernel/boot/
 
 # Clean up