Allow local authentication with LOCAL_AUTHENTICATION=1

You can touch `tmp/local-auth.txt` to persist this setting.

test/controllers/controller_authentication_test.rb

@@ -15,6 +15,24 @@ class ControllerAuthenticationTest < ActionDispatch::IntegrationTest
     assert_redirected_to Launchpad.login_url(product: true, account: Account.sole)
   end
 
+  test "local auth, access without an account slug redirects to launchpad" do
+    integration_session.default_url_options[:script_name] = "" # no tenant
+
+    with_local_auth do
+      get cards_path
+    end
+
+    assert_redirected_to Launchpad.login_url(product: true)
+  end
+
+  test "local auth, access with an account slug but no session redirects to new session" do
+    with_local_auth do
+      get cards_path
+    end
+
+    assert_redirected_to new_session_path
+  end
+
   test "access with an account slug and a session allows functional access" do
     sign_in_as :kevin