By Horaci Garcia and Christina Thykjaer MADRID (Reuters) – Furlough schemes may need to be introduced if a transport strike that is creating shortages of fresh produce continues, Spanish retail and food industry associations warned on Wednesday, cranking up pressure on the government to find a solution. The strike has spread since a loose group of drivers and small truck owners began blocking roads and ports last week in response to soaring fuel costs that have been exacerbated by Russia’s invasion of Ukraine. Three major transport associations joined the walkout after the government proposed …