This is an experimental appliance image for running the
fabrica snap build service on a pi4

There are two types of images you can choose from:
- A single image for SD cards where everything runs from the SD card.
  This image will be the easiest to deply but all your builds will run 
  with the I/O speed of the SD card. If you are not concerned about I/O
  speed, download pi4-fabrica.img.xz and write it to an SD card.

- A split image that effectively consists of two img files, an SD card one
  that contains the boot files to boot Ubuntu Core, and an USB one that
  contains the root filesystem. If you want to use this image, you want to
  download pi4-fabrica-combined-usb.tgz and unpack it.

  The tarball contains two img files: pi4-system-boot.img that you write
  to the SD card and pi4-usb-writable.img that should be written to a
  USB 3.1 SSD or to a USB 3.1 USB key. Boot your pi4 with SD and USB 
  plugged in.

Setting Up the image:
  
  Attach either a serial cable or a monitor and keyboard to your Pi
  If the boot is finished you will see a "Press enter to configure" message.
  Press enter to configure the network (note that you will currently not be
  able to configure a user due to [1]). At the end of the process the system
  will show you its new IP.
   
  After setting up the network, point your browser to the IP the system showed
  to you on port 8000 ... i.e. http://192.168.2.55:8000/ 
  
  You should see the fabrica UI now ... just add any cloneable git tree and
  watch snaps being magically built (the scheduler looks for new commits every 5 minutes).

Notes:

  The snaps used to build the images are in the snaps subdir, the model assertion is in
  the model-assertion subdir.

  Due to [2] curretly a kernel with extra config options is required for the USB image

  Both images are built from the edge channel !

  
Everything is still experimental !!!!
[1] https://bugs.launchpad.net/bugs/1881588
[2] https://bugs.launchpad.net/bugs/1881623