Pretty common question. I have the same problem in that I dont drink much until the weekends. I just stick my home roasted stuff into zip lock bags and then inside a normal airtight container. Nothing special. They stay pretty fresh for about three weeks and can stretch to four. You should be able to put the bag the coffee beans come (usually zip locked plastic) in an airtight container
Dont fill up the hopper, just put in what you need then grind that. Otheriwse the beans will go stale super fast.
Finally, buy a plunger for work or an aeropress. Thatll use up your stash ;)