[AppService] Fix #32044: az functionapp deployment source config-zip: Fix uploaded blob not containing content (#32119)

Author: calvinhzy

src/azure-cli/azure/cli/command_modules/appservice/custom.py

@@ -1666,7 +1666,12 @@ def progress_callback(current, total):
         progress_message = 'Uploading {} {}%'.format(progress_bar, percents)
         cmd.cli_ctx.get_progress_controller().add(message=progress_message)
 
-    blob_client = container_client.upload_blob(blob_name, src, validate_content=True, progress_hook=progress_callback)
+    blob_client = None
+    import os
+    with open(os.path.realpath(os.path.expanduser(src)), 'rb') as fs:
+        zip_content = fs.read()
+        blob_client = container_client.upload_blob(blob_name, zip_content, validate_content=True,
+                                                   progress_hook=progress_callback)
 
     now = datetime.datetime.utcnow()
     blob_start = now - datetime.timedelta(minutes=10)