Reproduction

https://github.com/nuxt/ecosystem-ci (before nuxt/ecosystem-ci@31c3164)

Describe the bug

discovered in:

• https://github.com/nuxt/ecosystem-ci/actions/runs/13618832251/job/38067214728
• https://github.com/nuxt/ecosystem-ci/actions/runs/13618832251/job/38067214308

ecosystem-ci (with a .git dir of its own) clones a repo in workspaces/<org>/<repo> and findWorkspaceDir is wrongly adding the ecosystem-ci root as its 'workspace'

Not sure if this is intended behaviour (if that's what's meant by this in #213):

Git directory is looked down similar to lockfile (so we don't wrongly detect sub-modules