fix(ci): clean fastrun cache in windows and macos ci

GitOrigin-RevId: d1a010287f5b9441f6813d0eebd5088e4da88ea3

imperative/python/megengine/utils/persistent_cache.py

@@ -20,8 +20,14 @@ from ..version import __version__
 
 class _FakeRedisConn:
     cache_file = None
+    _is_shelve = False
+    _dict = {}
 
     def __init__(self):
+        if os.getenv("MGE_FASTRUN_CACHE_TYPE") == "MEMORY":
+            self._dict = {}
+            self._is_shelve = False
+        else:
             try:
                 from ..hub.hub import _get_megengine_home
 
@@ -48,6 +54,10 @@ class _FakeRedisConn:
 
         self._dict[key] = val
 
+    def clear(self):
+        print("{} cache item in {} deleted".format(len(self._dict), self.cache_file))
+        self._dict.clear()
+
     def __del__(self):
         if self._is_shelve:
             self._dict.close()
@@ -87,3 +97,8 @@ class PersistentCacheOnServer(_PersistentCache):
         key = self._make_key(category, key)
         self._prev_get_refkeep = conn.get(key)
         return self._prev_get_refkeep
+
+    def clean(self):
+        conn = self._conn
+        if isinstance(conn, _FakeRedisConn):
+            conn.clear()