Dockworkers in 22 countries will strike on Friday, protesting against war and the use of ports for arms exports in action organisers say could disrupt over 40% of Mediterranean cargo and snarl over $2 billion worth of freight.The strike, originally called by dockworkers' unions in Italy, France, Greece, Spain's Basque Country, Turkey and Morocco, is now backed by more than 25 unions in 113 ports.The protest is expected to target major shipping hubs across Europe and beyond…