Add a workflow to run auto updates for pre-commit (#678)

* 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

* Use `autofix_commit_msg` and remove now useless fields

* Use the commit msg as the PR title too

* Switch to our releng/actions repo

Author: Eijebong

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

@@ -0,0 +1,15 @@
+name: Auto update pre-commit hooks every month
+on:
+  schedule:
+    - cron: '0 0 1 * *'
+jobs:
+  pre-commit:
+    name: Pre-commit
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+      pull-requests: write
+    steps:
+      - uses: mozilla-releng/actions/pre-commit-autoupdate@main
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}

.pre-commit-config.yaml

@@ -2,9 +2,7 @@
 # See https://pre-commit.com/hooks.html for more hooks
 ---
 ci:
-  autofix_commit_msg: "style: pre-commit.ci auto fixes [...]"
   autoupdate_commit_msg: "chore: pre-commit autoupdate"
-  autoupdate_schedule: monthly
 repos:
   - repo: https://github.com/pre-commit/pre-commit-hooks
     rev: v5.0.0