Add prtk PR automation

.github/workflows/check-pr.yml

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+name: check-pr
+
+concurrency:
+  group: prtk-pr-${{ github.event.pull_request.number }}
+  cancel-in-progress: true
+
+on:
+  pull_request_target:
+    types: [opened, synchronize, reopened, edited, ready_for_review, converted_to_draft]
+
+permissions:
+  contents: read
+  pull-requests: write
+  issues: write
+
+jobs:
+  check-pr:
+    if: github.repository_owner == 'ecmwf-ifs'
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    steps:
+
+      - name: Checkout code
+        uses: actions/checkout@v4
+        with:
+          ref: ${{ github.event.pull_request.base.sha }}
+
+      - name: Set up uv
+        uses: astral-sh/setup-uv@v5
+        with:
+          version: 0.6.12
+          enable-cache: false
+
+      - name: Install prtk
+        env:
+          PRTK_READ_ACCESS_TOKEN: ${{ secrets.PRTK_READ_ACCESS }}
+        run: |
+          uv tool install "git+https://${PRTK_READ_ACCESS_TOKEN}@github.com/ecmwf-ifs/prtk"
+
+      - name: Run prtk checks
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: >-
+          prtk check
+          --pr-number "${{ github.event.pull_request.number }}"
+          --default-branch "${{ github.event.repository.default_branch }}"
+          --event-name "${{ github.event_name }}"
+          --event-action "${{ github.event.action }}"

MAINTAINERS.yml

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+owner: ecmwf
+
+maintainers:
+  - Adehill
+
+checks:
+  ensure-assignee: {}
+  validate-target-branch:
+    allowed-branches:
+      - main
+      - main_staging
+    allowed-patterns:
+      - "openifs-*"
+      - "lts/*"
+      - "mts/*"
+      - "release/*"
+  assign-reviewers:
+    exclude-author: true
+    exclude-existing: true
+  copyright-audit:
+    reviewer: Adehill
+    skip-label: "prtk:skip-copyright"
+    allowed-holders:
+      - ECMWF
+      - European Centre for Medium-Range Weather Forecasts