chore: Automate the since updater

.github/workflows/run-since-updater.yml

@@ -0,0 +1,36 @@
+name: Run update-since-todo.py
+
+on:
+  schedule:
+    - cron: "0 16 * * THU"
+  workflow_dispatch:
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  run_script:
+    runs-on: ubuntu-latest
+    if: ${{ github.repository_owner == 'jenkinsci' }}
+    steps:
+      - uses: actions/checkout@v3
+      - name: Run update-since-todo.py
+        run: |
+          body=$(./update-since-todo.py)
+          body="${body//'%'/'%25'}"
+          body="${body//$'\n'/'%0A'}"
+          body="${body//$'\r'/'%0D'}" 
+          echo "PROGRESS=$body" >> $GITHUB_OUTPUT
+        id: run_script
+        shell: bash
+      - name: Create Pull Request
+        uses: peter-evans/create-pull-request@v4
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          commit-message: Fill in since annotations
+          title: Fill in since annotations
+          body: ${{ steps.run_script.outputs.PROGRESS }}
+          base: master
+          labels: skip-changelog
+          delete-branch: true