Docker build failed

Dockerfile の 50 行目と utilities/install.py から始め、特に 38 行目の execute 呼び出しと 206 行目の yarn install の呼び出しを確認してください。報告されている Ubuntu と Docker のバージョンでビルドを再現し、その後 yarn が利用できない理由を特定して、Docker イメージが正常にビルドされることを確認してください。

hellow~，I tried to use the code of the master branch to build the docker image, but it failed. I tried the code of 1.0.0 again and got the same error. Can anyone help me?
OS: Ubuntu 20.04
docker: 24.0.7

terminal logs:

45.92 Traceback (most recent call last):
45.92   File "utilities/install.py", line 242, in <module>
45.92     geppetto_branch=args.geppetto_version,
45.92   File "utilities/install.py", line 206, in main
45.92     execute(cmd=['yarn', 'install', '--immutable'], cwd=WEBAPP_DIR)
45.92   File "utilities/install.py", line 38, in execute
45.92     exit_code = subprocess.call(cmd, cwd=cwd, *args, **kwargs)
45.92   File "/opt/conda/lib/python3.7/subprocess.py", line 339, in call
45.92     with Popen(*popenargs, **kwargs) as p:
45.92   File "/opt/conda/lib/python3.7/subprocess.py", line 800, in __init__
45.92     restore_signals, start_new_session)
45.92   File "/opt/conda/lib/python3.7/subprocess.py", line 1551, in _execute_child
45.92     raise child_exception_type(errno_num, err_msg, err_filename)
45.92 FileNotFoundError: [Errno 2] No such file or directory: 'yarn': 'yarn'
------
Dockerfile:50
--------------------
  48 |     RUN jupyter serverextension enable --py --sys-prefix jupyter_geppetto
  49 |     
  50 | >>> RUN python utilities/install.py ${BUILD_ARGS} --workspace $WORKSPACE_VERSION --no-test
  51 |     
  52 |     RUN jupyter labextension disable @jupyterlab/hub-extension
--------------------
ERROR: failed to solve: process "/bin/bash -o pipefail -c python utilities/install.py ${BUILD_ARGS} --workspace $WORKSPACE_VERSION --no-test" did not complete successfully: exit code: 1