Cross-compilation with Buildroot and integration with localtunnel

Hello. I would like to run this web interface on a headless IoT device (Raspberry Pi 3B with Defender webcam) with an OS image built with Buildroot, and expose this web interface to the Internet using localtunnel. Please add an ability to cross-compile this V4L2 web interface project to aarch64 and integrate it into Buildroot. Localtunnel integration is secondary.