github actions

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

@@ -0,0 +1,31 @@
+name: Nix Flake actions
+
+on:
+  pull_request:
+  push:
+
+jobs:
+  nix-matrix:
+    runs-on: ubuntu-latest
+    outputs:
+      matrix: ${{ steps.set-matrix.outputs.matrix }}
+    steps:
+      - uses: actions/checkout@v4
+      - uses: cachix/install-nix-action@v30
+      - id: set-matrix
+        name: Generate Nix Matrix
+        run: |
+          set -Eeu
+          matrix="$(nix eval --json '.#githubActions.matrix')"
+          echo "matrix=$matrix" >> "$GITHUB_OUTPUT"
+
+  nix-build:
+    name: ${{ matrix.name }} (${{ matrix.system }})
+    needs: nix-matrix
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix: ${{fromJSON(needs.nix-matrix.outputs.matrix)}}
+    steps:
+      - uses: actions/checkout@v4
+      - uses: cachix/install-nix-action@v30
+      - run: nix build -L '.#${{ matrix.attr }}'

flake.nix

@@ -4,6 +4,11 @@
   inputs = {
     nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-unstable";
     flake-utils.url = "github:numtide/flake-utils";
+
+    nix-github-actions = {
+      url = "github:nix-community/nix-github-actions";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
   };
 
   # test_vm.nix
@@ -12,6 +17,7 @@
     {
       self,
       nixpkgs,
+      nix-github-actions,
       flake-utils,
     }:
     (flake-utils.lib.eachSystem [ "aarch64-linux" "x86_64-linux" ] (
@@ -39,9 +45,13 @@
       in
       {
         packages = flake_packages;
-        checks = flake_packages // {
-        };
+        checks = flake_packages;
         formatter = pkgs.nixfmt-rfc-style;
       }
-    ));
+    ))
+    // {
+      githubActions = nix-github-actions.lib.mkGithubMatrix {
+        checks = nixpkgs.lib.getAttrs [ "x86_64-linux" ] self.checks;
+      }; # todo: figure out testing on aarch64-linux
+    };
 }