Set up a basic CI that would simply build the library

[Russoul]

No description provided.

[phijor]

Since this project already has a Nix flake, a simple CI could be set up using Determinate Systems' Magic Nix Cache Action:

name: Build

on:
  push:
  pull_request:

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3
      - uses: DeterminateSystems/nix-installer-action@main
      - uses: DeterminateSystems/magic-nix-cache-action@main
      - uses: DeterminateSystems/flake-checker-action@main
      - name: Build LSP-lib with Nix
        run: nix build .

[Russoul]

Thanks. I know close to nothing how Nix works, so I'd rather have some else do the CI with Nix :)