Fix copy error on some systems

Using `cp -a` mode to the tmp directory from a container fails for
ubuntu 24.04 and opensuse 16.0 due failure of preserving permissions.
Using `cp -RP` will copy the directory recursivly not following any
symbolic links.

Author: fuhlig1

templates/test_project.sh.in

@@ -59,7 +59,7 @@ if [[ ! -d "$TEMPLATE_DIR" ]]; then
 fi
 
 cd "$MYTMPDIR"
-cp -a "$TEMPLATE_DIR" .
+cp -RP "$TEMPLATE_DIR" .
 cd "project_${CONTAINER_TYPE}_containers"
 ./rename.sh TestProj Tst det