Don't cache data folder // Resolve platformio#398

Author: valeros

builder/main.py

@@ -224,6 +224,7 @@ def __fetch_spiffs_size(target, source, env):
     if set(["buildfs", "uploadfs", "uploadfsota"]) & set(COMMAND_LINE_TARGETS):
         target_firm = env.DataToBin(
             join("$BUILD_DIR", "${ESP32_SPIFFS_IMAGE_NAME}"), "$PROJECTDATA_DIR")
+        env.NoCache(target_firm)
         AlwaysBuild(target_firm)
     else:
         target_firm = env.ElfToBin(