simplify the creation of the vhdx image, and remove the need for sudo

@chessturo is already working on this.

Since Nov 4, 2025.

**Is your feature request related to a problem? Please describe.**
Using the loop device can be tricky or impossible in CI and you can perfectly create an ext4 image without it.

**Describe the solution you'd like**
Use the following code in the `README.me` and in `./Microsoft/scripts/gen_modules_vhdx.sh`

instead of :

```bash
# Create a blank image file of the right size
dd if=/dev/zero of="$tmp_dir/modules.img" bs=1024 count=$((modules_size / 1024))

# Set up fs and mount
lo_dev=$(losetup --find --show "$tmp_dir/modules.img")
mkfs -t ext4 "$lo_dev"
mkdir "$tmp_dir/modules_img"
mount "$lo_dev" "$tmp_dir/modules_img"
chmod a+rw "$tmp_dir/modules_img"

# Copy over the contents of $1
cp -r "$1/lib/modules/$2"/* "$tmp_dir/modules_img"
umount "$tmp_dir/modules_img"
````

just do :

```bash
mke2fs -L '' -d "$1/lib/modules/$2" -b 1024 -t ext4 $tmp_dir/modules.img $modules_size
```

**Describe alternatives you've considered**

**Additional context**
Add any other context or screenshots about the feature request here.