[Bug]: FileNotFoundError due to missing pyproject.toml during PyPI package build

[openhands-agent]

Describe the bug and reproduction steps
A FileNotFoundError occurs due to a missing pyproject.toml file during the build process of our PyPI package. This leads to errors such as:

File "/opt/hostedtoolcache/Python/3.12.8/x64/lib/python3.12/site-packages/openhands/runtime/utils/runtime_build.py", line 312, in get_hash_for_lock_files
  with open(src, 'rb') as f:

Describe any potential solutions to the bug
Update the build scripts to ensure pyproject.toml is available or adjust the script to handle this missing file gracefully, if it doesn't exist.

Logs, Errors, Screenshots, and Additional Context
Error details provide insights regarding the missing file during runtime image building:
"[Errno 2] No such file or directory: '/opt/hostedtoolcache/Python/3.12.8/x64/lib/python3.12/site-packages/pyproject.toml'"

Issue Created By: Xingyao Wang on Slack

Link to Slack Thread: Slack Thread

[enyst]

Related or duplicate: #6223