Ah yes, now I see the issue. So, all of the example builds have been moved to kas configuration files as described here: Using kas to reproduce your Yocto builds. The one for building a 64bit-image for the Raspberry Pi 4 is meta-mender-community/kas/raspberrypi4-64.yml at scarthgap · mendersoftware/meta-mender-community · GitHub.
So essentially, without crafting a full blown tutorial overhaul:
- make sure your box fulfils the build requirements and has the
kastool installed git clone https://github.com/mendersoftware/meta-mender-community -b scarthgapmkdir -p meta-mender-community/my-raspberrypi4-64 && cd meta-mender-community/my-raspberrypi4-64kas build ../kas/raspberrypi4-64.yml
That should get you the build going.
Greets,
Josef