Add commits to user contribution graph

The contributions accounted so far are only requests, reviews
and comments to packages/projects.

Source changes next to requests are contributions/activity too,
so take it into the user graph. This is missing past activities,
import script will be provided later.

Co-authored-by: Ana María Martínez Gómez <anamaria@martinezgomez.name>

src/api/app/models/user.rb

@@ -64,6 +64,7 @@ class User < ApplicationRecord
   has_many :rss_feed_items, -> { order(created_at: :desc) }, class_name: 'Notification::RssFeedItem', as: :subscriber, dependent: :destroy
 
   has_and_belongs_to_many :announcements
+  has_many :commit_activities
 
   scope :all_without_nobody, -> { where('login != ?', NOBODY_LOGIN) }
   scope :not_deleted, -> { where.not(state: 'deleted') }

src/api/app/models/user/contributions.rb

@@ -7,7 +7,7 @@ def initialize(user, first_day)
   end
 
   def activity_hash
-    merge_hashes([requests_created, comments, reviews_done])
+    merge_hashes([requests_created, comments, reviews_done, commits_done])
   end
 
   private
@@ -25,6 +25,10 @@ def reviews_done
     Review.where(reviewer: user.login, state: [:accepted, :declined]).where('created_at > ?', first_day).group('date(created_at)').count
   end
 
+  def commits_done
+    user.commit_activities.group(:date).where('date > ?', first_day).sum(:count)
+  end
+
   def merge_hashes(hashes_array)
     hashes_array.inject { |h1, h2| h1.merge(h2) { |_, value1, value2| value1 + value2 } }
   end