ci: add log line for cache clearing

scripts/clear_cache.py

@@ -29,14 +29,14 @@ def delete_cache_request(key, id):
 
 
 def main():
-
     args = sys.argv
     env = os.environ
 
     key = env["GITHUB_TOKEN"]
-    pr_id = args[1]
+    pr_id = int(args[1])
     ref = "refs/pull/{}/merge".format(pr_id)
 
+    print("Clearing any caches generated by PR {}".format(pr_id))
     with urlopen(cache_list_request(key)) as response:
         response = json.load(response)
         caches = response["actions_caches"]