Add rake task to load sdg

This task should be useful for existing installations that are going
to upgrade the app and want to load SDG data into an already
existing database.

lib/tasks/consul.rake

@@ -1,5 +1,11 @@
 namespace :consul do
   desc "Runs tasks needed to upgrade to the latest version"
   task execute_release_tasks: ["settings:rename_setting_keys",
-                               "settings:add_new_settings"]
+                               "settings:add_new_settings",
+                               "execute_release_1.3.0_tasks"]
+
+  desc "Runs tasks needed to upgrade from 1.2.0 to 1.3.0"
+  task "execute_release_1.3.0_tasks": [
+    "db:load_sdg"
+  ]
 end

lib/tasks/db.rake

@@ -4,4 +4,10 @@ namespace :db do
     @avoid_log = args[:print_log] == "avoid_log"
     load(Rails.root.join("db", "dev_seeds.rb"))
   end
+
+  desc "Load SDG content into database"
+  task load_sdg: :environment do
+    ApplicationLogger.new.info "Adding Sustainable Development Goals content"
+    load(Rails.root.join("db", "sdg.rb"))
+  end
 end

spec/lib/tasks/load_sdg_spec.rb

@@ -0,0 +1,28 @@
+require "rails_helper"
+
+describe "rake db:load_sdg" do
+  before { Rake::Task["db:load_sdg"].reenable }
+
+  let :run_rake_task do
+    Rake.application.invoke_task("db:load_sdg")
+  end
+
+  it "populates empty databases correctly" do
+    SDG::Goal.destroy_all
+
+    run_rake_task
+
+    expect(SDG::Goal.count).to eq 17
+  end
+
+  it "does not create additional records on populated databases" do
+    expect(SDG::Goal.count).to eq 17
+
+    goal_id = SDG::Goal.last.id
+
+    run_rake_task
+
+    expect(SDG::Goal.count).to eq 17
+    expect(SDG::Goal.last.id).to eq goal_id
+  end
+end