trying to do github actions

.github/workflows/nix-github-actions.yml

@@ -0,0 +1,33 @@
+name: Nix Flake actions
+
+on:
+ pull_request:
+ push:
+ branches:
+ - master
+ - main
+
+jobs:
+ nix-matrix:
+ runs-on: ubuntu-latest
+ outputs:
+ matrix: ${{ steps.set-matrix.outputs.matrix }}
+ steps:
+ - uses: actions/checkout@v4
+ - uses: cachix/install-nix-action@v27
+ - id: set-matrix
+ name: Generate Nix Matrix
+ run: |
+ set -Eeu
+ matrix="$(nix eval --json '.#githubActions.matrix')"
+ echo "matrix=$matrix" >> "$GITHUB_OUTPUT"
+
+ nix-build:
+ needs: nix-matrix
+ runs-on: ${{ matrix.os }}
+ strategy:
+ matrix: ${{fromJSON(needs.nix-matrix.outputs.matrix)}}
+ steps:
+ - uses: actions/checkout@v4
+ - uses: cachix/install-nix-action@v27
+ - run: nix build -L '.#${{ matrix.attr }}'

flake.nix

@@ -11,10 +11,17 @@
  url = "github:jthlim/javelin-steno-rp2040";
  flake = false;
  };
- flake-utils.url = "github:numtide/flake-utils";
+ flake-utils = {
+ url = "github:numtide/flake-utils";
+ inputs.nixpkgs.follows = "nixpkgs";
+ };
+ nix-github-actions = {
+ url = "github:nix-community/nix-github-actions";
+ inputs.nixpkgs.follows = "nixpkgs";
+ };
  };
 
- outputs = { self, nixpkgs, flake-utils, javelin, javelin-rp2040 }: 
+ outputs = { self, nixpkgs, flake-utils, javelin, javelin-rp2040, nix-github-actions }: 
  flake-utils.lib.eachDefaultSystem (system: 
  let 
  pkgs = import nixpkgs {
@@ -32,6 +39,7 @@
  deps = with pkgs; [ cmake gcc-arm-embedded local-pico-sdk python3];
  my_yask_file = ./yask.h;
  in rec { 
+ githubActions = nix-github-actions.lib.mkGithubMatrix { checks = self.packages; };
  packages.default = pkgs.stdenv.mkDerivation {
  name = "javelin-rp2040";
  src = javelin-rp2040;