The Publish Wiki workflow was failing with fatal: this operation must be run in a work tree because Andrew-Chen-Wang/github-wiki-action@v4 was configured with environment variables instead of action inputs.

Changes

• Replace incorrect env: configuration with proper with: inputs
• Set path: docs to specify wiki source directory
• Remove unused env vars (WIKI_DIR, GH_TOKEN, GH_MAIL, GH_NAME) — token defaults to github.token

# Before
- uses: Andrew-Chen-Wang/github-wiki-action@v4
  env:
    WIKI_DIR: docs/
    GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}

# After
- uses: Andrew-Chen-Wang/github-wiki-action@v4
  with:
    path: docs

• Fixes Publish wiki job is failing #45

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