Add workflow to update last modified date in Markdown

Author: brown9804

.github/workflows/update-md-date.yml

@@ -0,0 +1,43 @@
+name: Update Last Modified Date
+
+on:
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  update-date:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Set up Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: '3.x'
+
+      - name: Install dependencies
+        run: pip install python-dateutil
+
+      - name: Configure Git 
+        run: |
+          git config --global user.email "github-actions[bot]@users.noreply.github.com"
+          git config --global user.name "github-actions[bot]"
+          
+      - name: Update last modified date in Markdown files
+        run: python .github/workflows/update_date.py
+
+      - name: Commit changes
+        env:
+          TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          git fetch origin
+          git pull --rebase origin ${{ github.event.pull_request.head.ref }} || echo "No rebase needed"
+          git add -A
+          git commit -m "Update last modified date in Markdown files" || echo "No changes to commit"
+          git remote set-url origin https://x-access-token:${TOKEN}@github.com/${{ github.repository }}
+          git push origin HEAD:${{ github.event.pull_request.head.ref }}