Try this

Author: jrfnl

.github/workflows/publish-wiki.yml

@@ -30,12 +30,18 @@ jobs:
     if: github.repository == 'PHPCSStandards/PHP_CodeSniffer-documentation'
 
     runs-on: ubuntu-latest
+
     steps:
       - name: Checkout code
         uses: actions/checkout@v4
 
       - name: Copy wiki files to temporary location
-        run: cp -v -a ./wiki/ ./build/_wiki/
+        shell: bash
+        run: cp -v -a wiki build/_wiki
+
+      - name: Verify files were correctly copied
+        shell: bash
+        run: ls -aRlh build/_wiki
 
       - name: Deploy to wiki
         uses: Andrew-Chen-Wang/github-wiki-action@v4