Add a workflow to run auto updates for pre-commit

This replaces the pre-commit.ci app's autoupdate.

The one caveat with this is that it doesn't check for PRs that are
already opened on that branch. I did that to keep it as simple as
possible. It's not a real issue as github will detect that and close the
previous PR and then open a new one but it might be a bit spammy if we
don't merge those PRs

Author: Eijebong

.github/workflows/pre-commit-autoupdate.yml

@@ -0,0 +1,36 @@
+name: Autoupdate
+on:
+  schedule:
+    - cron: '0 0 1 * *'
+jobs:
+  pre-commit:
+    name: Pre-commit
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+      pull-requests: write
+    steps:
+      - uses: actions/checkout@v4
+      - name: Setup git
+        run: |
+          git config --global user.name "Pre-commit automation"
+          git config --global user.email "releng+pre-commit-autoupdate@mozilla.com"
+      - uses: actions/setup-python@v5
+      - run: python -m pip install pre-commit
+        shell: bash
+      - name: Update files
+        run: |
+          git checkout -B pre-commit-update
+          pre-commit autoupdate -j4
+          git add .pre-commit-config.yaml
+          git commit -am "Update pre-commit"
+          git push -f origin pre-commit-update
+      - name: Create PR if necessary
+        run: |
+          curl -sL \
+          -X POST \
+          -H "Accept: application/vnd.github+json" \
+          -H "Authorization: Bearer ${{ secrets.GITHUB_TOKEN }}" \
+          -H "X-GitHub-Api-Version: 2022-11-28" \
+          https://api.github.com/repos${{ github.reository_owner }}/${{ github.repository }}/pulls \
+          -d '{"title":"Update pre-commit","body":"","head":"pre-commit-update","base":"${{ github.event.repository.default_branch }}"}'