Support running the server on linux-arm64

[pimterry]

To do this, we need to do the below in approximately this order:

• [ ] Get the server usable locally for development, such that it can be checked out, npm installed and started successfully
• [ ] Check for any dependencies that don't provide prebuilds in this environment, and see if we can solve that upstream
• [ ] See if we can build production releases for linux-arm64 when running directly on a linux-arm64 machine
• [ ] See if we can cross-build linux-arm64 from a linux-x64 machine (that's how CI works for every other target - generally by downloading prebuilds for native components, instead of actually cross-compiling)
• [ ] Update CI to automatically build for this target
• [ ] Publish a release with a linux-arm64 build