Support for ESP-IDF v5.0 CI

[georgik]

ESP-IDF v5.0 should become available mid-summer 2022.
Make sure that build works well with Rust.

[georgik]

Blocked by esp-rs/esp-idf-sys#99

[brianredbeard]

Upstream blocker is currently closed.

[georgik]

5.1 with activated ESP-IDF fails. Created issue #150

Test with 5.0:

git clone --branch v5.0-beta1 --recursive --depth 1 --shallow-submodules git@github.com:espressif/esp-idf.git esp-idf-v5.0-beta1
cd esp-idf-v5.0-beta1
./install.sh
source ./export.sh
cd ../esp-idf-rs-test
cargo espflash --release

Build with activated environment failed:

  --- stderr
  Build configuration: BuildConfig {
      esp_idf_tools_install_dir: None,
      esp_idf_sdkconfig: None,
      esp_idf_sdkconfig_defaults: None,
      mcu: None,
      native: NativeConfig {
          esp_idf_version: Some(
              Tag(
                  "v5.0",
              ),
          ),
          esp_idf_repository: None,
          esp_idf_cmake_generator: None,
          idf_path: Some(
              "/Users/rust/projects/esp-idf-v5.0-beta1",
          ),
          extra_components: [],
          esp_idf_components: None,
      },
      esp_idf_sys_root_crate: None,
  }
  Using activated esp-idf v5.0.0 environment at '/Users/rust/projects/esp-idf-v5.0-beta1'
  ERROR: /Users/rust/projects/esp-idf-rs-test/.embuild/espressif/python_env/idf5.0_py3.9_env/bin/python doesn't exist! Please run the install script or "idf_tools.py install-python-env" in order to create it
  CMake Error at /Users/rust/projects/esp-idf-v5.0-beta1/tools/cmake/build.cmake:346 (message):
    Some Python dependencies must be installed.  Check above message for
    details.
  Call Stack (most recent call first):
    /Users/rust/projects/esp-idf-v5.0-beta1/tools/cmake/build.cmake:484 (__build_check_python)
    CMakeLists.txt:14 (idf_build_process)


  thread 'main' panicked at '
  command did not execute successfully, got: exit status: 1

  build script failed, must exit now', /Users/rust/.cargo/registry/src/gitproxy.zycloud.tk-1ecc6299db9ec823/cmake-0.1.48/src/lib.rs:975:5
  note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace