Yes:
* During the strike, show solidarity by not crossing picket lines. Don't use the service, and don't patron the business for the duration of the strike. This is because during the strike, the workers that are filling in for the strikers are scabs and crossing the picket line.
* Spread the news, their demands, and encourage solidarity with these workers.
Strength is in numbers and solidarity. When that breaks down, the movement breaks down. It's why many States and companies do everything in their power to prevent the wage-earners from organizing effectively.
This skips a step. Who gave the strikers the right to choose this for the entire workforce? If my coworker says "I strike" and I stay at my desk, does that make me a "scab"? The article gives no information about who the workers are, how many of their fellow workers they represent, how long they've been doing the job. I'm not sure what would qualify them to speak for everybody, but it's got to be more than giving a quote to NPR, and surely it depends how many of them there are, relative to their coworkers.
Yes. Call it scab, strikebreaker, whatever; you are undermining your coworkers' demands and weakening the strike. Of course it's not easy to strike, but it's necessary if you support their demands. You show solidarity and support by striking with your coworkers. It's most powerful when done as a whole block.