diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index dae47f55..9392d075 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -14,16 +14,17 @@ concurrency:
 
 jobs:
   haskell:
-    strategy:
-      fail-fast: true
-      matrix:
-        os:
+    # strategy:
+      # fail-fast: true
+      # matrix:
+      #   os:
           # - macos-13 # x64
-          - ubuntu-latest
+          # - ubuntu-latest
         # devShell:
         #   - ghc810
         #   - ghc90
-    runs-on: ${{ matrix.os }}
+    # runs-on: ${{ matrix.os }}
+    runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
       - uses: cachix/install-nix-action@v27
@@ -48,8 +49,8 @@ jobs:
       #   run: |
       #     ./bin/${{ matrix.devShell }} -c ghc --version
       #     ./bin/${{ matrix.devShell }} -c cabal --version
-      - run: nix develop --accept-flake-config -c ghc --version
-        timeout-minutes: 2
+      - run: nix build --accept-flake-config
+        timeout-minutes: 10
       #   timeout-minutes: 5
       # - name: Update package index
       #   run: ./bin/${{ matrix.devShell }} -c cabal update
diff --git a/flake.nix b/flake.nix
index 50644e18..f222a630 100644
--- a/flake.nix
+++ b/flake.nix
@@ -12,6 +12,7 @@
   };
 
   outputs = inputs@{ self, flake-utils, haskellNix, nixpkgs }:
+    # https://input-output-hk.github.io/haskell.nix/tutorials/getting-started-flakes.html
     flake-utils.lib.eachDefaultSystem (system:
       let
         overlays = [
@@ -31,5 +32,7 @@
         };
         flake = pkgs.hapistrano.flake { };
       in
-      flake);
+      flake // {
+        packages.default = flake.packages."hapistrano:exe:hap";
+      });
 }