diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index cfc65d1..399c09f 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -38,4 +38,4 @@ jobs:
           token: ${{ secrets.ATTIC_TOKEN }}
 
       - name: Build Nix Package
-        run: nix build -f test.nix -I nixpkgs=https://github.com/NixOS/nixpkgs/archive/nixpkgs-unstable.tar.gz --show-trace
+        run: nix build --impure --show-trace -L .#test
diff --git a/flake.nix b/flake.nix
index d49e135..988133f 100644
--- a/flake.nix
+++ b/flake.nix
@@ -1,5 +1,5 @@
 {
-  description = "";
+  description = "Github Action for caching Nix derivations with attic";
 
   inputs = {
     nixpkgs.url = "nixpkgs/nixos-unstable";
@@ -26,6 +26,16 @@
       };
     });
 
-    formatter = forEachSystem (p: p.nixpkgs-fmt);
+    formatter = forEachSystem (p: p.alejandra);
+
+    packages = forEachSystem (p: let
+      time = toString builtins.currentTime;
+      test = p.runCommand "test-${time}" {} ''
+        echo ${time} > $out
+      '';
+    in {
+      inherit test;
+      default = test;
+    });
   };
 }
diff --git a/test.nix b/test.nix
deleted file mode 100644
index 409ef43..0000000
--- a/test.nix
+++ /dev/null
@@ -1,7 +0,0 @@
-let
-  pkgs = import <nixpkgs> { };
-  time = with builtins; toString currentTime;
-in
-pkgs.runCommand "${time}-test" { } ''
-  echo "${time}" > $out
-''