Try this

Author: jrfnl

.github/workflows/publish-wiki.yml

@@ -36,6 +36,18 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v4
 
+      - name: Copy wiki files to temporary location
+        shell: bash
+        run: cp -v -a wiki _wiki
+
+      - name: Preface markdown files with warning not to edit in place
+        # yamllint disable rule:line-length
+        run: >
+          find ./_wiki/ -name "*.md*"
+          -exec sed -i
+          '1i\<!--\nDO NOT EDIT THIS FILE IN THE WIKI.\nThis wiki is updated from the https://github.com/PHPCSStandards/PHP_CodeSniffer-documentation repo.\nSubmit a PR to that repo updating the file in the `/wiki/` subdirectory instead.\n-->\n\n' {} \;
+          # yamllint enable rule:line-length
+
       - name: Check GitHub Git Operations status
         uses: crazy-max/ghaction-github-status@v4
         with:
@@ -47,7 +59,7 @@ jobs:
           COMMIT_MSG: ${{ github.event.head_commit.message }}
         with:
           strategy: 'clone'
-          path: 'wiki/'
+          path: '_wiki/'
           commit-message: ${{ env.COMMIT_MSG }}
           # repository: PHPCSStandards/PHP_CodeSniffer
           # token: ${{ secrets.PHPCS_PUSH_TO_WIKI_TOKEN }}