rootfs/usr/local/bin/autorun: adding autorun checks on new fat32 formatted USER partition

to allow for arbitrary user data.

Containerfile

@@ -183,7 +183,7 @@ EOF
 COPY --from=util-linux . .
 RUN <<-EOF
     set -eux
-    # Increase the size of the ISO by 512 MB to create space for the third partition
+    # Increase the size of the ISO by X MB to create space for the third partition
     dd if=/dev/zero bs=1M count=512 >> airgap.iso
 
     # Append a new partition that uses the additional space

Makefile

@@ -73,7 +73,7 @@ vm-efi: out/airgap.iso
 		-drive id=external,if=none,format=raw,file=out/sdcard.img \
 		-display gtk,show-menubar=off,zoom-to-fit=on \
         -device usb-storage,drive=usbdrive \
-        -drive id=usbdrive,if=none,format=raw,file=out/airgap.iso \
+        -drive id=usbdrive,if=none,format=raw,file=airgap.iso \
 		-boot order=c
 
 ## Signing, Verification, and Release Targets

rootfs/usr/local/bin/autorun

@@ -4,6 +4,8 @@ source /etc/profile
 
 folder=${1?}
 
+echo "Checking autorun in folder: ${folder}" >/dev/console
+
 if [ "$folder" == "/media/USER" ] && [ -f "${folder}/autorun.sh" ]; then
 	if touch "${folder}/.write_test" 2>/dev/null; then
         echo "!! Autorun: Read-only verification failed for /media/USER" >/dev/console