Scan MR description when syncing builds with Jira

This scans the MR description for Jira issue keys when syncing
builds with Jira. Issue keys can be included in:

* MR title
* MR description
* Branch name
* Commit message

Commit messages will not be scanned here because they need to be loaded
from Gitaly and this can cause N+1 problems.

Changelog: fixed

lib/atlassian/jira_connect/serializers/build_entity.rb

@@ -26,7 +26,7 @@ module Atlassian
           # merge request title.
           @issue_keys ||= begin
             pipeline.all_merge_requests.flat_map do |mr|
-              src = "#{mr.source_branch} #{mr.title}"
+              src = "#{mr.source_branch} #{mr.title} #{mr.description}"
               JiraIssueKeyExtractor.new(src).issue_keys
             end.uniq
           end

spec/factories/merge_requests.rb

@@ -33,6 +33,10 @@ FactoryBot.define do
       title { generate(:jira_title) }
     end
 
+    trait :jira_description do
+      description { generate(:jira_description) }
+    end
+
     trait :jira_branch do
       source_branch { generate(:jira_branch) }
     end

spec/factories/sequences.rb

@@ -18,6 +18,7 @@ FactoryBot.define do
   sequence(:draft_title) { |n| "Draft: #{n}" }
   sequence(:wip_title) { |n| "WIP: #{n}" }
   sequence(:jira_title) { |n| "[PROJ-#{n}]: fix bug" }
+  sequence(:jira_description) { |n| "This is a description\n here is the description\n Related to: PROJ-#{n}" }
   sequence(:jira_branch) { |n| "feature/PROJ-#{n}" }
   sequence(:job_name) { |n| "job #{n}" }
   sequence(:work_item_type_name) { |n| "bug#{n}" }

spec/lib/atlassian/jira_connect/serializers/build_entity_spec.rb

@@ -31,7 +31,7 @@ RSpec.describe Atlassian::JiraConnect::Serializers::BuildEntity do
   context 'when the pipeline does belong to a Jira issue' do
     let(:pipeline) { create(:ci_pipeline, merge_request: merge_request) }
 
-    %i[jira_branch jira_title].each do |trait|
+    %i[jira_branch jira_title jira_description].each do |trait|
       context "because it belongs to an MR with a #{trait}" do
         let(:merge_request) { create(:merge_request, trait) }