build a boot2qt image with docker
this basically automates these steps
- i don't have a server running version < ubuntu focal (20)
- building with focal results in an error
- glibc apparently replaced stime, which causes that error
- building with focal results in an error
# if you just want to build for raspberrypi4 and qt 5.15.0
./b2qt.sh
# if you want to build a completely custom image
./b2qt.sh 5.9.0 raspberrypi0
| \> https://doc.qt.io/QtForDeviceCreation/qtee-custom-embedded-linux-image.html#building-the-image-and-toolchain
| (the machine table contains the required values)
\> https://code.qt.io/cgit/yocto/boot2qt-manifest.git/tree/
the output should be in ./output/{MACHINE}.img/
for example if you run the script with the default arguments
there should be a 'raspberrypi4.img' directory in ./output/