Add missing stage when doing retry on a build

CHANGELOG

@@ -12,6 +12,7 @@ v7.14.0 (unreleased)
   - Added support for CI skipped status
   - Fix broken yaml error saving
   - Rename type(s) to stage(s)
+  - Add missing stage when doing retry
   
 v7.13.1
   - Fix: user could steal specific runner

app/models/build.rb

@@ -77,6 +77,7 @@ class Build < ActiveRecord::Base
       new_build.project_id = build.project_id
       new_build.name = build.name
       new_build.allow_failure = build.allow_failure
+      new_build.stage = build.stage
       new_build.save
       new_build
     end