Document wallpaper-with-IP process

[FDelporte]

One of the great things of Pi4J OS is the wallpaper with the IP info. Can we document a how-to for this?

Found on https://forums.raspberrypi.com/viewtopic.php?t=259108 a way to do this with Python.

Java single file app is prepared (but still needs to be tested on RPi):
https://github.com/Pi4J/pi4j-jbang/blob/main/GenerateWallpaperInfoImage.java

DISPLAY=:0 java GenerateWallpaperInfoImage.java wallpaper-source.png wallpaper-output.png
crontab -e

# Add the following line to the crontable:
@reboot (sleep 90; java /home/pi/wallpaper/GenerateWallpaperInfoImage.java /home/pi/wallpaper/wallpaper-source.png /home/pi/wallpaper/wallpaper-output.png)

[DieterHolz]

If we have the how-to, we can integrate it in our "build-script"