Hundreds of people lined the banks of Glasgow’s River Clyde a few weeks ago for the rare sight of a small, high-end cruise ship sailing upriver — practically into the heart of the city. The Azamara Journey thrilled socially distanced onlookers by blasting its horn, typically a heralding of lively celebration. But this time nobody was there to wave on the deck of the 700-passenger ship, aside from the couple dozen members of its skeleton crew. This was no celebratory arrival, after all: It was a vessel on life support, just like every other ship dealing with the pandemic’s brutal wake.