I realized that I made a mistake in my second "Playing with Wails app builder" video. Building from source was broken as I was still relying on the JS/CSS artefacts from a local build, and the dependencies for them aren't going to play well with flatpack-builder's restrictions on build tools. So Part 3 was born!
Playing with Wails app builder: Part 3 – A better Flatpak manifest for Wails | Always Developing #57