ADD open_devops_count column fro projects tables

db/migrate/20200925090122_add_open_devops_count_to_projects.rb

@@ -0,0 +1,5 @@
+class AddOpenDevopsCountToProjects < ActiveRecord::Migration[5.2]
+  def change
+    add_column :projects, :open_devops_count, :integer, default: 0, comment: '针对同一台ci服务器激活devops流程的次数'
+  end
+end