I recently got one of those nifty new Raspberry Pi 400 models, and Joplin was of course the first thing I wanted running on it
There is no official support for ARM64 architectures, but after some digging I managed to cobble together a little bash script to build Joplin from source. The only tweak required was to remove the use of the keytar module.
Other than that, it seems to work! I'm really thrilled to use this Pi as a note-taking device and I thought I'd share the script with anyone who might find this useful.