Docker firmware builder is not working, outdated

[dasinking]

The Docker method from the README.md is not working for me. Seems like it is outdated, as it is still using pico-sdk 1.5.1 while the repo switched to 2.0.0 over a year ago. There's also CMake version errors.

[  5%] Performing configure step for 'PioasmBuild'
loading initial cache file /home/dev/build_docker/pico-sdk/src/rp2_common/pico_cyw43_driver/pioasm/tmp/PioasmBuild-cache-RELEASE.cmake
CMake Error at CMakeLists.txt:1 (cmake_minimum_required):
  Compatibility with CMake < 3.5 has been removed from CMake.

  Update the VERSION argument <min> value.  Or, use the <min>...<max> syntax
  to tell CMake that the project requires at least <min> but has been updated
  to work with policies introduced by <max> or earlier.

  Or, add -DCMAKE_POLICY_VERSION_MINIMUM=3.5 to try configuring anyway.


-- Configuring incomplete, errors occurred!
make[2]: *** [pico-sdk/src/rp2_common/pico_cyw43_driver/CMakeFiles/PioasmBuild.dir/build.make:92: pico-sdk/src/rp2_common/pico_cyw43_driver/pioasm/src/PioasmBuild-stamp/PioasmBuild-configure] Error 1
make[1]: *** [CMakeFiles/Makefile2:2257: pico-sdk/src/rp2_common/pico_cyw43_driver/CMakeFiles/PioasmBuild.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....

The VScode method worked way better. Also, I was able to use iit on Linux, so I'll submit a PR to change the README.