Update the Discord integration embed

The embed now includes a timestamp of when the message
was sent and a color, defaulted to GitLab's logo color.

Changelog: changed
Helped-by: Luke Duncalfe <lduncalfe@eml.cc>
Helped-by: Arturo Herrero <arturo.herrero@gmail.com>

app/models/integrations/discord.rb

@@ -54,6 +54,8 @@ module Integrations
         builder.add_embed do |embed|
           embed.author = Discordrb::Webhooks::EmbedAuthor.new(name: message.user_name, icon_url: message.user_avatar)
           embed.description = (message.pretext + "\n" + Array.wrap(message.attachments).join("\n")).gsub(ATTACHMENT_REGEX, " \\k<entry> - \\k<name>\n")
+          embed.colour = 16543014 # The hex "fc6d26" as an Integer
+          embed.timestamp = Time.now.utc
         end
       end
     rescue RestClient::Exception => error

spec/models/integrations/discord_spec.rb

@@ -11,7 +11,9 @@ RSpec.describe Integrations::Discord do
         embeds: [
           include(
             author: include(name: be_present),
-            description: be_present
+            description: be_present,
+            color: be_present,
+            timestamp: be_present
           )
         ]
       }
@@ -47,15 +49,19 @@ RSpec.describe Integrations::Discord do
         allow(client).to receive(:execute).and_yield(builder)
       end
 
-      subject.execute(sample_data)
+      freeze_time do
+        subject.execute(sample_data)
 
-      expect(builder.to_json_hash[:embeds].first).to include(
-        description: start_with("#{user.name} pushed to branch [master](http://localhost/#{project.namespace.path}/#{project.path}/commits/master) of"),
-        author: hash_including(
-          icon_url: start_with('https://www.gravatar.com/avatar/'),
-          name: user.name
+        expect(builder.to_json_hash[:embeds].first).to include(
+          description: start_with("#{user.name} pushed to branch [master](http://localhost/#{project.namespace.path}/#{project.path}/commits/master) of"),
+          author: hash_including(
+            icon_url: start_with('https://www.gravatar.com/avatar/'),
+            name: user.name
+          ),
+          color: 16543014,
+          timestamp: Time.now.utc.iso8601
         )
-      )
+      end
     end
 
     context 'DNS rebind to local address' do