Add security secret "last_sign_in"

In order to comply with the security measure for the
ENS: "[op.acc.5.r5.2] The user shall be informed of
the last access made with his identity".

We have added a new secret to display the last
access made to the user on the "My account" page.

spec/components/account/sign_in_info_component_spec.rb

@@ -0,0 +1,26 @@
+require "rails_helper"
+
+describe Account::SignInInfoComponent do
+  let(:account) { create(:user, last_sign_in_at: Date.current, last_sign_in_ip: "1.2.3.4") }
+
+  context "Security secret for render last sign in is enabled" do
+    it "shows a sign in info" do
+      allow(Rails.application).to receive(:secrets).and_return(ActiveSupport::OrderedOptions.new.merge(
+        security: { last_sign_in: true }
+      ))
+
+      render_inline Account::SignInInfoComponent.new(account)
+
+      expect(page).to have_content "Last login:"
+      expect(page).to have_content "from IP"
+    end
+  end
+
+  context "Security secret for render last sign in is disabled" do
+    it "does not show sign in info" do
+      render_inline Account::SignInInfoComponent.new(account)
+
+      expect(page).not_to be_rendered
+    end
+  end
+end