ATHENS (Reuters) – Metro trains ground to a halt and ships were docked in ports as thousands of workers joined May Day rallies in the Greek capital to protest against soaring energy and food prices. Gas and power bills have surged, with price rises exacerbated by sanctions against Russia following its Feb. 24 invasion of Ukraine, taking inflation in Greece to multi-year highs. Police estimate that some 10,000 people marched in central Athens and gathered outside the Greek parliament over the cost of living that they say is becoming unaffordable. “It is very tough, and every day it gets tougher…