change for docker compiler not download new platformio version.

platformio.ini

@@ -27,7 +27,7 @@ version_flags = "-DMAVESP8266_VERSION_MINOR="${version.minor} "-DMAVESP8266_VERS
 # - Run prebuild script to set firmware name
 
 [env]
-platform = espressif8266@1.8.0
+platform = espressif8266
 framework = arduino
 build_flags = !echo "-DPIO_SRC_REV="$(git rev-parse HEAD) "-DPIO_BUILD_DATE="$(date +%%Y-%%m-%%d) "-DPIO_BUILD_TIME="$(date +%%H:%%M:%%S) ${version_env.version_flags}
 extra_scripts = pre:platformio_prebuild.py