Try setting up github actions

Author: benley

.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.lock

@@ -4,10 +4,16 @@
   inputs = {
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-24.05";
     flake-utils.url = "github:numtide/flake-utils";
+    nix-github-actions.url = "github:nix-community/nix-github-actions";
+    nix-github-actions.inputs.nixpkgs.follows = "nixpkgs";
   };
 
-  outputs = { self, nixpkgs, flake-utils }:
-    flake-utils.lib.eachDefaultSystem (system:
+  outputs = { self, nixpkgs, flake-utils, nix-github-actions }:
+    {
+      githubActions = nix-github-actions.lib.mkGithubMatrix {
+        checks = nixpkgs.lib.getAttrs [ "x86_64-linux" ] self.checks;
+      };
+    } // flake-utils.lib.eachDefaultSystem (system:
       let
         pkgs = nixpkgs.legacyPackages.${system};
 
@@ -30,6 +36,8 @@
 
         packages.default = self.packages.${system}.${packageName};
 
+        checks.tailscale-manager = self.packages.${system}.tailscale-manager;
+
         devShells.default = pkgs.mkShell {
           buildInputs = with pkgs; [
             haskellPackages.haskell-language-server # you must build it with your ghc to work