Update 'DebIMG.jenkinsfile'

DebIMG.jenkinsfile

@@ -53,7 +53,7 @@ pipeline {
             // Save generated files
             archiveArtifacts artifacts: '*.tar.xz', followSymlinks: false
             // Copy artifacts to /LXCBuild folder
-            cp *.tar.xz /LXCBuild
+            sh '''cp *.tar.xz /LXCBuild'''
             // Cleaning WorkSpace
             //cleanWs()
             }