New builder image

[Apache02]

New builder image:

• based on lightweight alpine
• replaced old scons by latest from alpine packages
  • python updated from 2 to 3
  • replaced python scripts by https://github.com/RT-Thread/rt-thread/tree/master/tools
• replaced gcc-arm-none-eabi by latest from alpine packages
  • this required minor changes in code
• added encrypt_crc from https://github.com/Apache02/a9-hello-world/tree/main/tools/encrypt_crc
  • added build of rtthread_crc.bin to build script (this file can be flashed by uartprogram)