Building a teslausb image

To build a ready to flash one-step setup image for CIFS, do the following:

1. Clone pi-gen from https://github.com/RPi-Distro/pi-gen
2. Follow the instructions in the pi-gen readme to install the required dependencies
3. In the pi-gen folder, run:

   echo 'IMG_NAME=teslausb' > config
   echo 'HOSTNAME=teslausb' >> config
   echo 'STAGE_LIST="stage0 stage1 stage2 stage_teslausb"' >> config
   rm -rf stage2/EXPORT_NOOBS
   mkdir stage_teslausb
   touch stage_teslausb/EXPORT_IMAGE
   cp stage2/prerun.sh stage_teslausb/prerun.sh
   
4. Copy teslausb/pi-gen-sources/00-teslausb-tweaks to the pi-gen/stage_teslausb folder
5. Run build.sh or build-docker.sh, depending on how you configured pi-gen to build the image
6. Sit back and relax, this could take a while (for reference, on a dual-core 2.6 Ghz Intel Core i3 and 50 Mbps internet connection, it took under an hour) If all went well, the image will be in the deploy folder. Use Etcher or similar tool to flash it.