ANSWER:

No problem in this

The prohibition is serving food in the daytime of Ramadan. 

People still need to buy food in the daytime of Ramadan to eat at the time of iftar

QUESTION: Is it permissible to work at a grocery store during Ramadan? Because there i have to put drinks, generally edible products and there are people who dont fast so they buy things.

Fasting, Fasting and Ramadan, Halal/Haram Matters |