assign PAT to checkout action

.github/workflows/markdown2gempost.yml

@@ -19,10 +19,10 @@ defaults:
 jobs:
   md2gmi:
     runs-on: ubuntu-latest
-    permissions:
-      contents: write
     steps:
       - uses: actions/checkout@v4
+        with:
+          token: ${{ secrets.MY_GH_TOKEN }}
       - uses: ./.github/actions/markdown2gempost
         with:
           input-dir: 'markdown/incoming'
@@ -31,6 +31,5 @@ jobs:
       - uses: stefanzweifel/git-auto-commit-action@v5
         with:
           commit_message: 'convert Markdown post to Gempost'
-          token: ${{ secrets.MY_GH_TOKEN }}