Answer
In the Name of Allah, Most Gracious, Most Merciful.
All praise and thanks are due to Allah, and peace and blessings be upon His Messenger.
In this fatwa:
1- If selling pig meat is something that is common and it is part of a grocery in places where Muslims are a minority, this is a small issue that you can overlook.
2- However, if the main or the only activity of the store is selling pig meat, you are not allowed, as a Muslim, to be involved in this.
Answering your question, Dr. Jasser Auda, Professor and Al-Shatibi Chair of Maqasid Studies at the International Peace College South Africa, states:
Whether you are a new Muslim or a born Muslim, the issue of working in a place that sells pig meat is the same issue.
It really depends on where you are, i.e. geographically. If it is something that is common in the land where you are and it is part of a grocery store that you work in and it is an integral part of grocery stores in places where Muslims are a minority, then in this case it is a small issue that you can overlook.
That is different from a store where the main or the only activity is selling pork, in this case, you are not allowed as a Muslim to be involved in this.
But individually every person is aware of the necessities. If there is a necessity if you are already working in a place and you make a living out of this place, you can continue until you find another place. The matter of necessity is individualistic and it is up to the assessment of every Muslim.
Almighty Allah knows best.