Remove force unmount because I think its corrupting the filesystem with unclean dismount.

scripts/build_image/build_alpine.bash

@@ -18,7 +18,7 @@ function cleanup {
     done
     for (( idx=${#mountedfolders[@]}-1 ; idx>=0 ; idx-- )) ; do
         >&2 echo "Unmounting folder ${mountedfolders[idx]}"
-        umount -f "${mountedfolders[idx]}"
+        umount "${mountedfolders[idx]}"
     done
     for f in "${memorydevices[@]}"; do
         >&2 echo "Removing memory device $f"