Set up automated dependency updates via self-hosted Renovate (#20)

Run Renovate on a weekday schedule (plus manual dispatch) to open
dependency-update PRs, keeping the JS/bun and Android/Gradle stacks
current without manual tracking. Grouping rules keep version-locked
package families (react-native core, react, graphql-codegen,
react-navigation) updating atomically so PRs stay buildable.

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: dfalling

.github/workflows/renovate.yml

@@ -0,0 +1,20 @@
+name: Renovate
+
+on:
+  schedule:
+    - cron: '0 6 * * 1-5'  # Weekdays at 6am UTC
+  workflow_dispatch:
+
+jobs:
+  renovate:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: renovatebot/github-action@v46.1.9
+        with:
+          token: ${{ secrets.RENOVATE_TOKEN }}
+        env:
+          RENOVATE_REPOSITORIES: ${{ github.repository }}
+          RENOVATE_ONBOARDING: 'false'
+          RENOVATE_REQUIRE_CONFIG: optional
+          RENOVATE_GIT_AUTHOR: 'Renovate Bot <bot@renovateapp.com>'

renovate.json

@@ -0,0 +1,36 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": ["config:recommended"],
+  "packageRules": [
+    {
+      "description": "Group the React Native core and its tooling — they are pinned to the same release and must bump atomically",
+      "matchPackageNames": [
+        "react-native",
+        "/^@react-native\\//",
+        "/^@react-native-community\\//"
+      ],
+      "groupName": "react-native"
+    },
+    {
+      "description": "Group React and its companions — react-test-renderer is pinned to the React version",
+      "matchPackageNames": ["react", "react-test-renderer", "@types/react"],
+      "groupName": "react"
+    },
+    {
+      "description": "Group all GraphQL Codegen packages together",
+      "matchPackageNames": ["/^@graphql-codegen\\//"],
+      "groupName": "graphql-codegen"
+    },
+    {
+      "description": "Group all React Navigation packages together",
+      "matchPackageNames": ["/^@react-navigation\\//"],
+      "groupName": "react-navigation"
+    },
+    {
+      "description": "Auto-merge patch updates for GitHub Actions",
+      "matchManagers": ["github-actions"],
+      "matchUpdateTypes": ["patch"],
+      "automerge": true
+    }
+  ]
+}