The CSA would arrange for the launch of each CubeSat, most likely a bulk buy through an secondary payload launch service provide such as NanoRacks, Spaceflight Industries or Antrix.
Of note, at the Canadian SmallSat Symposium held this past February, one of the speakers was Alex MacDonald, Senior Economic Advisor, Office of the Administrator, NASA who gave a presentation (below) titled Towards a Canadian Spacecraft Nation: Applying Lessons from Silicon Valley and NASA to Expand Canadian Small Satellite Capabilities. The presentation in part advocated launching a CubeSat from each province. Alex it should be noted is Canadian.
Whether it’s a coincidence that the CSA is moving forward with a similar idea like Alex’s doesn’t matter. Only good things can come from this initiative.