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Improve the explanation of workdir_parent config (#519)

Fix #512

act_runner adds a '/' before the path (see https://gitea.com/gitea/act_runner/src/commit/5977042b86f22454d51c8027a009cb0a40337e52/internal/app/run/runner.go#L186) . So `workdir_parent` doesn't need to have the prefix '/'.

If `workdir_parent` has the prefix '/', errors will occur when reading files from the job container.

Reviewed-on: https://gitea.com/gitea/act_runner/pulls/519
Reviewed-by: Jason Song <i@wolfogre.com>
Co-authored-by: Zettat123 <zettat123@gmail.com>
Co-committed-by: Zettat123 <zettat123@gmail.com>
This commit was merged in pull request #519.
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