fuel.nix

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This would give us an idea of whether fuel.nix could be a viable replacement for fuelup in CI, in terms of latency to install forc.

Just for reference, today downstream users should already be able to use tools from fuel.nix in CI actions with something like this:

jobs:
  my-build-job:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/[email protected]
      - uses: cachix/install-nix-action@v20
        with:
          nix_path: nixpkgs=channel:nixos-unstable
          extra_nix_config: |
            extra-substituters = https://fuellabs.cachix.org
            extra-trusted-public-keys = fuellabs.cachix.org-1:3gOmll82VDbT7EggylzOVJ6dr0jgPVU/KMN6+Kf8qx8=
      - run: nix shell github:fuellabs/fuel.nix#forc-0-39-0
      # Following steps now have `forc` version `0.39.0` available.
      - run: forc build

But yes, it would be great to test latency, and perhaps provide some wrapper action that takes care of the cachix installation with the necessary binary cache etc.

Another thought w.r.t. latency:

If it turns out that relying directly on the fuellabs cache does take too long, I'd imagine there's some way to provide a docker image that provides forc pre-fetched? I don't have enough docker experience to be sure :sweat_smile: