Turned linkify_haarchion into a rake task

lib/tasks/linkify_haarchion.rake

@@ -0,0 +1,20 @@
+require 'csv'
+
+desc 'Import Haarchion audio links from CSV'
+task :linkify_haarchion, [:csv_file] => :environment do |taskname, args|
+  lines = CSV.read(args.csv_file)[1..-1] # skip header row
+  puts "Creating links for #{lines.size} records..."
+  lines.each do |line|
+    mid = line[4][line[4].rindex('/') + 1..-1]
+    next if ExternalLink.exists?(url: line[5], linkable_id: mid,
+                                 linkable_type: 'Manifestation')
+
+    ExternalLink.create!(url: line[5],
+                         description: 'להקראת היצירה באתר הארכיון - ספרות עברית בקול',
+                         status: :approved,
+                         linktype: :audio,
+                         linkable_id: mid,
+                         linkable_type: 'Manifestation')
+  end
+  puts 'done.'
+end