feat: overengineer standard steps

default.nix

@@ -66,4 +66,32 @@ in
     expr = repr: "\${{ ${repr} }}";
     secret = name: expr "secrets.${name}";
   };
+
+  steps =
+    {
+      __functor =
+        self:
+        {
+          name,
+          url,
+          defaultVersion,
+        }:
+        self
+        // {
+          ${name} =
+            {
+              __version ? defaultVersion,
+              ...
+            }@args:
+            {
+              uses = "${url}@${__version}";
+              "with" = builtins.removeAttrs args [ "__version" ];
+            };
+        };
+    }
+      {
+        name = "checkout";
+        defaultVersion = "v3";
+        url = "actions/checkout";
+      };
 }