What is the right course of action now?

When a tram stops at a tram stop without a protective island, German traffic rules require extra caution. If the tram is stopped and passengers may cross the road to get on or off, drivers must slow down to walking speed (about 7-10 km/h) and must not overtake the tram. If people are actually crossing, you must stop and wait until all passengers have safely embarked or disembarked and the road is clear. Only then may you proceed. This rule is designed to protect passengers who need to cross your lane to reach the tram or the sidewalk since there is nothing to separate them from traffic. So, in this situation, the correct and safe course of action is not to overtake the tram.