By Caroline Pailliez and Forrest Crellin PARIS (Reuters) -France on Wednesday ordered some staff at an Exxon Mobil fuel depot back to work and warned a TotalEnergies’ depot could be next, risking a wider conflict with trade unions as it battles to secure petrol supplies after weeks of strikes. The French energy ministry said it was requisitioning some staff at the Gravenchon-Port Jerome depot run by Exxon’s Esso France business, where the hardline CGT remains on strike despite a pay deal with other unions. Trade unions are demanding wage increases to help workers cope with spiralling inflation…