Add workflow for updating lockfile weekly

.github/workflows/update_lockfile.yml

@@ -0,0 +1,36 @@
+name: update-lockfile
+
+on:
+  workflow_dispatch:
+  schedule:
+    - cron: 0 8 * * 1
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  lock:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: astral-sh/setup-uv@v5
+
+      - run: |
+          echo "\`\`\`" > uv_output.md
+          uv lock --upgrade 2>&1 | tee -a uv_output.md
+          echo "\`\`\`" >> uv_output.md
+
+      - name: Create pull request
+        uses: peter-evans/create-pull-request@v7
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          commit-message: Update uv lockfile
+          title: Update uv lockfile
+          body-path: uv_output.md
+          branch: update-uv-lockfile
+          base: main
+          labels: release-notes:dependency
+          delete-branch: true
+          add-paths: uv.lock