fix: fix adding safe-directory in container

[marcus-wirtz-snkeos]

solves issue #2031

[Copilot]

Pull request overview

This PR aims to fix safe.directory handling so git operations work reliably when the checked-out repository is accessed from container environments (e.g., /github/workspace), by adding the container-mapped path as an additional safe directory.

Changes:

• Capture GITHUB_WORKSPACE on inputs and plumb it through settings.
• Update checkout flow to add safe.directory for both the host repository path and the container workspace path.
• Remove test/workflow hacks that globally set safe.directory=*.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/input-helper.ts	Stores resolved GITHUB_WORKSPACE into settings for later container-path calculations.
src/git-source-settings.ts	Adds githubWorkspacePath to the settings interface.
src/git-source-provider.ts	Adds helper functions to compute container repo path and to add multiple safe.directory entries.
test/verify-worktree.sh	Removes blanket global safe.directory=* to rely on action behavior.
.github/workflows/test.yml	Removes blanket global safe.directory=* in the container test job.

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