If it were a personal project then it could be a fun learning experience to build it with Phoenix, but for a client where time is of the essence I wouldn’t try reinventing the wheel for my own sake. An ecommerce site has all sorts of moving parts under the hood that would take quite a while to get even halfway to what shopify offers, the #1 thing being the seller dashboard where they can manage their business, sells, inventory, chargebacks etc.
Gotta use the right tools for the job.
If you decide to go with Phoenix though, this thread should be a good resource: Resources for building an e-commerce store in Phoenix?
