add renovate changesets (#817)

.github/renovate.json5

@@ -2,8 +2,9 @@
   '$schema': 'https://docs.renovatebot.com/renovate-schema.json',
   extends: [
     'config:recommended',
-    'schedule:earlyMondays', // https://docs.renovatebot.com/presets-schedule/#scheduleearlymondays
+    'schedule:earlyMondays', // https://docs.renovatebot.com/presets-schedule/#scheduleearlymondays,
   ],
+  labels: ['dependencies'],
   rangeStrategy: 'bump',
   ignoreDeps: [
     'eslint', // ignore until dependencies support flat configs

.github/workflows/renovate-changesets.yml

@@ -0,0 +1,20 @@
+name: Add changeset to renovate PRs
+
+on:
+  pull_request:
+    types: [opened, synchronize, labeled]
+
+concurrency: ${{ github.workflow }}-${{ github.ref }}
+
+jobs:
+  renovate:
+    name: Update Renovate PR
+    runs-on: ubuntu-latest
+    if: contains(github.event.pull_request.labels.*.name, 'dependencies')
+
+    steps:
+      - name: Update PR
+        uses: mscharley/[email protected]
+        with:
+          token: ${{ secrets.RENOVATE_TOKEN }}
+          use-conventional-commits: true