TAIPEI—Taiwan reacted with an outpouring of thanks to the United States for shipping 2.5 million COVID-19 vaccine doses to the major semiconductor-producing island, more than doubling its arsenal as it deals with a rise in domestic infections. Washington initially had promised to donate 750,000 doses but increased that number as President Joe Biden’s administration advances its pledge to send 80 million U.S.-made shots around the world. “What a sight! What a gesture!” Taiwan Foreign Minister Joseph Wu tweeted in thanks late on Saturday, linking to pictures of the vaccines being loaded onto a China Airlines Boeing 777 freighter at Memphis airport. “The Taiwan-U.S. relationship is rock solid, & we’ll keep cooperating closely in combating COVID19. Forces for good will prevail!” Taiwan President Tsai Ing-wen tweeted she was touched by the U.S. move. “Thank you to the U.S. for this moving gesture of friendship. These vaccines will go a long way …