What is the ruling on working as a gardener in a Christian graveyard?

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Check below answers in case you are looking for other related questions:
It is not allowed to plant trees on graves
Bidaa'h of gathering after fourty days to pray for the deceased

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Related Answers:
Darkening or changes in the face because of death or because of terminal illness are not indicative of a bad end
Ruling on burying the deceased in a coffin
Competing to carry the bier
It is not allowed to plant trees on graves
Bidaa'h of gathering after fourty days to pray for the deceased

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