Add renovate github action

.github/workflows/approve-renovate-pull-request.yml

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+name: "Approve Renovate Pull Request"
+
+on:
+  pull_request:
+    branches: [main]
+
+# Increase the access for the GITHUB_TOKEN
+permissions:
+  # This Allows the GITHUB_TOKEN to approve pull requests
+  pull-requests: write
+  # This Allows the GITHUB_TOKEN to auto merge pull requests
+  contents: write
+
+env:
+  PR_URL: ${{github.event.pull_request.html_url}}
+  # By default, GitHub Actions workflows triggered by renovate get a GITHUB_TOKEN with read-only permissions.
+  GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}
+
+jobs:
+  approve_renovate_pull_requests:
+    runs-on: ubuntu-latest
+    name: Approve renovate pull request
+    if: ${{ (github.actor == 'Octobob') && (contains(github.head_ref, 'renovate')) }}
+    steps:
+      - name: Approve a renovate created PR
+        run: gh pr review --approve "$PR_URL"

.github/workflows/update-dependencies.yml

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+name: Renovate update dependencies
+on:
+  schedule:
+    # UTC 10:00 PM (8AM AEST, Monday - Thursday)
+    - cron: '0 22 * * 1-5'
+  workflow_dispatch:
+    inputs:
+      dry-run:
+        description: 'Dry run'
+        required: false
+        default: true
+        type: boolean
+
+jobs:
+  renovate-backend:
+    name: Self-hosted Renovate
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Self-hosted Renovate
+        uses: renovatebot/github-action@v39.0.1
+        with:
+          configurationFile: renovate-config.js
+          token: ${{ secrets.RENOVATE_GITHUB_TOKEN }}
+        env:
+          LOG_LEVEL: debug
+          RENOVATE_DRY_RUN: ${{ inputs.dry-run && 'full' || null }}

renovate-config.js

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+const excludeList = [
+    "dotnet-sdk", // The dotnet SDK update is a non-trivial piece of work.
+];
+
+module.exports = {
+
+    timezone: "Australia/Brisbane",
+    requireConfig: "optional",
+    onboarding: false,
+
+    ignoreDeps: excludeList,
+    enabledManagers: ["nuget"],
+
+    // Full list of built-in presets: https://docs.renovatebot.com/presets-default/
+    extends: [
+        "config:base",
+        "group:monorepos",
+        "group:recommended",
+		":rebaseStalePrs",
+        ":automergeRequireAllStatusChecks",
+    ],
+
+    // Renovate will create a new issue in the repository.
+    // This issue has a "dashboard" where you can get an overview of the status of all updates.
+    // https://docs.renovatebot.com/key-concepts/dashboard/
+    dependencyDashboard: true,
+    dependencyDashboardTitle: "Halibut Dependency Dashboard",
+
+    platform: "github",
+    repositories: ["OctopusDeploy/Halibut"],
+    reviewers: ["OctopusDeploy/team-server-at-scale"],
+    labels: ["dependencies", "Halibut"],
+    branchPrefix: "renovate-dotnet/",
+
+    // Limit the amount of PRs created
+    prConcurrentLimit: 2,
+    prHourlyLimit: 1,
+
+    // If set to false, Renovate will upgrade dependencies to their latest release only. Renovate will not separate major or minor branches.
+    // https://docs.renovatebot.com/configuration-options/#separatemajorminor
+    separateMajorMinor: false,
+};