health workflow pub workspaces support

[dcharkes]

The health workflow for leaked symbols and breaking API changes from https://github.com/dart-lang/ecosystem/blob/main/.github/workflows/health.yaml does not seem to support pub workspaces yet.

Could not find workspace for package pkgs/native_assets_cli
Error: PathNotFoundException: Cannot copy file to '/tmp/YTYJVZ/.dart_tool/package_config.json', path = 'pkgs/native_assets_cli/.dart_tool/package_config.json' (OS Error: No such file or directory, errno = 2)

The .dart_tool/package_config.json is two directories up, where the pub workspace is defined.

Logs:

• https://github.com/dart-lang/native/actions/runs/14337544710/job/40188392610?pr=2181
• https://github.com/dart-lang/native/actions/runs/14337544710/job/40188392625?pr=2181

[dcharkes]

We need to incorporate:

• [fix] add Dart workspace support bmw-tech/dart_apitool#202

[dcharkes]

Or maybe that's not the issue

$ pwd
/Users/dacoharkes/src/dart-lang/native/pkgs/native_assets_cli
$ dart /Users/dacoharkes/src/bmw-tech/dart_apitool/bin/main.dart extract --input /Users/dacoharkes/src/dart-lang/native/pkgs/native_assets_cli --output /var/folders/2y/mngq9h194yzglt4kzttzfq6800klzg/T/oQfK9y/leaks.json    
# this succeeds

$ dart /Users/dacoharkes/src/bmw-tech/dart_apitool/bin/main.dart extract --input . --output /var/folders/2y/mngq9h194yzglt4kzttzfq6800klzg/T/oQfK9y/leaks.json
Could not find workspace for package .
Error: PathNotFoundException: Cannot copy file to '/var/folders/2y/mngq9h194yzglt4kzttzfq6800klzg/T/urSghM/.dart_tool/package_config.json', path = './.dart_tool/package_config.json' (OS Error: No such file or directory, errno = 2)