File _multibuild of Package openSUSE-repos

<multibuild>
  <flavor>openSUSE-repos-Leap</flavor>
  <flavor>openSUSE-repos-LeapMicro</flavor>
  <flavor>openSUSE-repos-Tumbleweed</flavor>
  <flavor>openSUSE-repos-MicroOS</flavor>
</multibuild>