fix chainloading to linux properly

vm/Dockerfile.initramfs

@@ -2,7 +2,7 @@ FROM alpine:3.22@sha256:4bcff63911fcb4448bd4fdacec207030997caf25e9bea4045fa6c8c4
 RUN apk --no-cache add busybox-static
 RUN mkdir -p /tmp/initramfs/bin && cp /bin/busybox.static /tmp/initramfs/bin/busybox && \
   chroot /tmp/initramfs /bin/busybox --install -s /bin && \
-  chroot /tmp/initramfs ln -s /bin/sh /init && \
+  chroot /tmp/initramfs ln -s /bin/init /init && \
   cd /tmp/initramfs && \
   find . | cpio -R 0:0 --ignore-devno --renumber-inodes -o -H newc --quiet > /initramfs && \
   rm -rf /tmp/initramfs