feat: build binary for aarch64-unknown-linux-gnu

[bajtos]

Add the following item to the matrix release builds:

• aarch64-unknown-linux-gnu to allow running Zinnia in GNU-based Linux distros (e.g. Debian) running on Apple Silicon (M1/M2)

See #75 and CheckerNetwork/core#92

I tried to add MUSL targets to support Alpine-based docker images. Unfortunately, Deno does not support MUSL yet, see:

• target x86_64-unknown-linux-musl denoland/rusty_v8#49
• provide binaries for aarch64-unknown-linux-musl denoland/rusty_v8#596
• Release musl builds denoland/deno#3711

I opened a follow-up issue here:

• Binaries for Alpine Linux (*-unknown-linux-musl) #178

[bajtos]

How to verify the setup:

1. Download the "archives" for arm64 from GHA run, e.g. https://github.com/filecoin-station/zinnia/actions/runs/4687576517

2. Extract the archive, then extract the zinnia & zinniad archives.

3. Assuming you have the extracted files in ~/Downloads/archives-linux-arm64, run the following Docker command:

   ❯ docker run -it --entrypoint /bin/bash -v ~/Downloads/archives-linux-arm64:/archives ubuntu:bionic

4. Then, inside the running Docker container.

   Smoke test:

   root@33a680b31043:/# /archives/zinniad --version
   zinniad 0.6.0
   

   Run some JavaScript to test V8 low-level stuff:

   root@33a680b31043:/# echo 'console.log("hello world")' > test.js
   root@33a680b31043:/# /archives/zinnia run test.js
   hello world