new_contents: from django.contrib import admin
  from repocracy.repo.models import Repository
  
  class RepositoryAdmin(admin.ModelAdmin):
      actions = ['update_from_origin']
  
      def update_from_origin(self, request, queryset):
          for obj in queryset:
              obj.update()
  
      update_from_origin.short_description = 'Update repository from origin'
  
  admin.site.register(Repository, RepositoryAdmin)
  
subject: Add repository admin.