Add renovate

.github/workflows/linting.yml

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+name: Linting
+
+on:
+  push:
+    branches:
+      - main
+      - "renovate/**"
+  pull_request:
+
+jobs:
+  linting:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout source
+        uses: actions/checkout@8ade135a41bc03ea155e62e844d188df1ea18608 # v4
+
+      - name: Cache pre-commit
+        uses: actions/cache@v3
+        with:
+          path: ~/.cache/pre-commit
+          key: pre-commit-${{ hashFiles('.pre-commit-config.yaml') }}
+
+      - name: Set up python
+        uses: actions/setup-python@v4
+        with:
+          python-version: "3.x"
+
+      - name: Install dependencies
+        run: |-
+          python -m pip install pre-commit
+          pre-commit install
+
+      - name: Run pre-commit
+        run: pre-commit run --all-files --color always --verbose

.pre-commit-config.yaml

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+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v4.5.0
+    hooks:
+      - id: check-case-conflict
+      - id: check-merge-conflict
+      - id: end-of-file-fixer
+      - id: mixed-line-ending
+        args: [--fix=lf]
+      - id: trailing-whitespace
+  - repo: https://github.com/pre-commit/mirrors-prettier
+    rev: v3.0.3
+    hooks:
+      - id: prettier
+  - repo: https://github.com/renovatebot/pre-commit-hooks
+    rev: 37.12.1
+    hooks:
+      - id: renovate-config-validator
+        args: [renovate/default-config.json]
+  - repo: https://github.com/codespell-project/codespell
+    rev: v2.2.6
+    hooks:
+      - id: codespell

.renovaterc.json

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+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": [
+    "config:base",
+    "schedule:weekdays",
+    ":automergeAll",
+    ":automergeBranch",
+    ":disableDependencyDashboard",
+    ":enablePreCommit"
+  ],
+  "commitMessageAction": "Renovate:",
+  "packageRules": [
+    {
+      "description": "Shorten commit titles",
+      "commitMessageTopic": "{{depName}}",
+      "matchManagers": ["github-actions", "pre-commit"]
+    }
+  ]
+}

README.md

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+# .github
+
+Default files for all repositories

renovate/README.md

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+# Renovate
+
+To enable `Renovate` in a given repository, one must install and enable the
+[GitHub application](https://github.com/apps/renovate).
+One must then make a `.renovaterc.json` file in the repository, of the following
+form.
+Note, the two `/` is intentional.
+
+```json
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": ["github>UCL-ARC/.github//renovate/default-config.json"]
+}
+```
+
+## Automerging
+
+To benefit from the automerging capabilities of the default config it is
+_highly_ recommended having `required` status checks that run on anything that
+`Renovate` updates.
+In `GitHub Actions` this can be performed with the following at the top of the
+relevant workflows, which will run `Renovate` on pull requests or branches.
+
+```yaml
+on:
+  push:
+    branches:
+      - main
+      - "renovate/**"
+  pull_request:
+```
+
+The following `GitHub` settings are required.
+
+- `Allow auto-merge`
+
+The following branch rules to the base branch are also recommended.
+
+- `Require status checks to pass before merging` ✅
+  - `Require branches to be up to date before merging` ✅
+    - List all status checks that should be mandatory here
+
+If the repository requires pull requests, then one must also configure the
+following.
+
+- `Allow specified actors to bypass required pull requests` ✅
+  - Add `renovate` here

renovate/default-config.json

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+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": [
+    "config:base",
+    "schedule:weekdays",
+    ":automergeBranch",
+    ":automergeDigest",
+    ":automergeMinor",
+    ":automergePatch",
+    ":disableDependencyDashboard",
+    ":enablePreCommit"
+  ],
+  "commitMessageAction": "Renovate:",
+  "packageRules": [
+    {
+      "description": "Shorten commit titles",
+      "commitMessageTopic": "{{depName}}",
+      "matchManagers": ["bundler", "github-actions", "pre-commit"]
+    }
+  ]
+}