Add Aman to the list of high-end resort companies getting into the cruise business. The Russian-owned hospitality brand is joining forces with a branch of Saudi Arabia’s investment fund to launch an all-suite, yacht-like luxury cruise vessel by 2026, according to the shipyard that will build the ship. Italy’s T. Mariotti shipyard on Friday announced that a joint venture between Aman and the Saudi investment entity known as Cruise Saudi had signed a contract with the shipyard for the construction of the as-yet-unnamed vessel. For more cruise news, guides and tips, sign up for TPG’s cruise newsletter. T. Mariotti offered few details of what the ship would be like other…