Catch ArchiveError and ignore errors if it's already archived

app/workers/ci/archive_traces_cron_worker.rb

@@ -12,7 +12,9 @@ module Ci
       Ci::Build.finished.with_live_trace.find_each(batch_size: 100) do |build|
         begin
           build.trace.archive!
-        rescue => e
+        rescue ArchiveError => e
+          next if e.message.include?('Already archived')
+
           failed_archive_counter.increment
           Rails.logger.error "Failed to archive stale live trace. id: #{build.id} message: #{e.message}"
         end