Oliver Glasner warned Crystal Palace’s job was only half-finished after they secured a 3-1 Conference League last-four first-leg victory over Shakhtar Donetsk and took one step closer to the Leipzig final. Ismaila Sarr made competition history in Krakow, opening the scoring in a record 21 seconds, but Shakhtar – again playing at “home” in Poland due to the ongoing war in Ukraine – replied with an Oleh Ocheretko equaliser two minutes into the second half. Daichi Kamada fired the Eagles back in front two minutes before the hour, then turned provider for substitute Jorgen Strand Larsen , who added a late third to send Palace back to Selhurst Park with a two-goal cushion. “Overall we are very pleased with the performance but it’s just the first step,” said the Palace boss, speaking to TNT.…