Containerized version of the driver installation to be deployed on https://www.balena.io/os/.
Note: Since the boot partition of BalenaOS is read-only, add the wm8960-soundcard.dtbo file to the overlays/ folder before flashing the image onto the Raspberry Pi. Also add the following lines to the config.txt file of the boot partition on the SD card:
dtparam=i2s=on
dtoverlay=i2s-mmap
dtoverlay=wm8960-soundcard
After deploying the project to my Pi Zero, I changed the DT parameters as suggested in the [DAC configuration] setting the custom configuration variable BALENA_HOST_CONFIG_dtoverlay to "wm8960-soundcard".
The repository for the complete project can be found here: https://github.com/AnomahR/balena-sound