diff --git a/flake.nix b/flake.nix
index a196eb7..921d0e1 100644
--- a/flake.nix
+++ b/flake.nix
@@ -43,9 +43,11 @@
   nixConfig = {
     extra-substituters = [
       "https://cache.iog.io"
+      "https://cache.garnix.io"
     ];
     extra-trusted-public-keys = [
       "hydra.iohk.io:f/Ea+s+dFdN+3Y/G+FDgSq+a5NEWhJGzdjvKNGv0/EQ="
+      "cache.garnix.io:CTFPyKSLcx5RMJKfLo5EEPUObbA78b0YQ2DTCJXqr9g="
     ];
     allow-import-from-derivation = true;
   };
diff --git a/garnix.yaml b/garnix.yaml
new file mode 100644
index 0000000..da969a1
--- /dev/null
+++ b/garnix.yaml
@@ -0,0 +1,3 @@
+builds:
+  include:
+  - 'checks.*.*'
diff --git a/nix/outputs.nix b/nix/outputs.nix
index 48c87c8..7135e5e 100644
--- a/nix/outputs.nix
+++ b/nix/outputs.nix
@@ -9,6 +9,17 @@ in
 [
   (
     # Docs for project.flake: https://github.com/input-output-hk/iogx/blob/main/doc/api.md#mkhaskellprojectoutflake
-    project.flake
+    project.flake // {
+      checks = let
+        # https://github.com/numtide/flake-utils/issues/121#issuecomment-2589899217
+        recurseIntoDeepAttrs = attrs:
+          lib.recurseIntoAttrs (lib.mapAttrs (_: v:
+            if builtins.typeOf v == "set" && !lib.isDerivation v
+            then recurseIntoDeepAttrs v
+            else v
+          ) attrs);
+      in
+        inputs.iogx.inputs.flake-utils.lib.flattenTree (recurseIntoDeepAttrs project.flake.hydraJobs);
+    }
   )
 ]