Update precommit task with Credo

mix.exs

@@ -78,7 +78,6 @@ defmodule GcIndexRelay.MixProject do
       setup: ["deps.get", "ecto.setup"],
       "ecto.setup": ["ecto.create", "ecto.migrate", "run priv/repo/seeds.exs"],
       "ecto.reset": ["ecto.drop", "ecto.setup"],
-      test: test_alias(),
       "test.unit": ["test --only unit"],
       "test.integration": [
         "ecto.create --quiet",
@@ -89,19 +88,9 @@ defmodule GcIndexRelay.MixProject do
         "compile --warnings-as-errors",
         "deps.unlock --unused",
         "format",
-        "test.integration"
+        "credo",
+        "test.unit"
       ]
     ]
   end
-
-  # Conditionally set up database for tests
-  # Set REQUIRE_DB=true to run database migrations before tests
-  # Or use mix test.integration for integration tests with database
-  defp test_alias do
-    if System.get_env("REQUIRE_DB") == "true" do
-      ["test.integration"]
-    else
-      ["test"]
-    end
-  end
 end