All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad, sallallaahu 'alayhi wa sallam, is His slave and Messenger.
It is impermissible to serve food that contains pork to those who eat it. There is no doubt that this clearly constitutes helping them in disobeying Allah, The Almighty, just as serving alcohol to those who drink it constitutes helping them in committing this sin. Therefore, it is incumbent upon you to repent to Allah, The Almighty. Also, it is impermissible for you to retain this job as long as you would continue to help people eat pork.
You should seek a different job, one that does not involve disobeying Allah, and always heed the following verses, wherein Allah, The Exalted, Says (what means):
• {And whoever fears Allah – He will make for him a way out * And will provide for him from where he does not expect. And whoever relies upon Allah – then He is sufficient for him…} [Quran 65: 2-3]
• He also Says (what means): {And whoever fears Allah – He will make for him of his matter ease.} [Quran 65: 4]
Allah Knows best.