Do not reuse cache from driver creation

python/dune/perftool/compile.py

@@ -78,7 +78,7 @@ def compile_form():
 
     from dune.perftool.generation import cache_context
     if get_option("driver_file"):
-        with cache_context('driver'):
+        with cache_context('driver', delete=True):
             generate_driver(form, get_option("driver_file"))
 
     if get_option("operator_file"):