Fix volume issues by mounting a dir

Extract a pre-existing image there if one doesn't already exist

entrypoint.sh

@@ -0,0 +1,23 @@
+#!/bin/sh
+
+image_path="/data/filesystem.img"
+zip_path="/filesystem.zip"
+
+if [ ! -e $image_path ] && [ -e $zip_path ]; then
+    unzip $zip_path
+    mv *.img $image_path
+fi
+
+exec qemu-system-arm \
+  -M versatilepb \
+  -cpu arm1176 \
+  -m 256M \
+  -hda /data/filesystem.img \
+  -net nic \
+  -net user,hostfwd=tcp::5022-:22 \
+  -dtb /root/qemu-rpi-kernel/versatile-pb.dtb \
+  -kernel /root/qemu-rpi-kernel/kernel-qemu-4.19.50-buster \
+  -append "root=/dev/sda2 panic=1" \
+  -no-reboot \
+  -display none \
+  -serial mon:stdio