[GR-31836] Don't use pyc files during image build

PullRequest: graalpython/1882

Author: gilles-duboscq

ci.jsonnet

@@ -1 +1 @@
-{ "overlay": "429f4a03748bab84b7953c634f2b93136c4f649d" }
+{ "overlay": "ed0c3b687243ee4a9214a25a3010e1a1eab14813" }

graalpython/lib-python/3/importlib/_bootstrap_external.py

@@ -312,6 +312,8 @@ def cache_from_source(path, debug_override=None, *, optimization=None):
     If sys.implementation.cache_tag is None then NotImplementedError is raised.
 
     """
+    if __graalpython__.in_image_buildtime:
+        return
     if debug_override is not None:
         _warnings.warn('the debug_override parameter is deprecated; use '
                        "'optimization' instead", DeprecationWarning)