Support arm64 platform

[sindreij]

I get this message

error /home/user/[..]/node_modules/graphql_ppx: Command failed.
Exit code: 1
Command: node copyPlatformBinaryInPlace.js
Arguments:
Directory: /home/user/[..]/node_modules/graphql_ppx
Output:
graphql_ppx does not support this platform :(
graphql_ppx comes prepacked as built binaries to avoid large
dependencies at build-time.
If you want graphql_ppx to support this platform natively,
please open an issue at our repository, linked above. Please
specify that you are on the linux platform,

Would be awesome if this could support the arm64 (armv8) platform, I am running on a https://www.scaleway.com/ server.

Btw, thank you for a awesome library!

[thangngoc89]

You can try to build graphql-ppx from source instead.

[mhallin]

Are there hosted arm64 CI services available, or is anyone familiar with OCaml's cross compilation story here who wants to help out?