chore: simplify workflows

.github/config.js

@@ -0,0 +1,17 @@
+module.exports = {
+  branchPrefix: 'ga-renovate/',
+  dryRun: true,
+  gitAuthor: 'Renovate Bot <bot@renovateapp.com>',
+  logLevel: 'debug',
+  onboarding: false,
+  platform: 'github',
+  repositories: ['renovatebot/github-action'],
+  packageRules: [
+    {
+      description: 'lockFileMaintenance',
+      updateTypes: ['lockFileMaintenance'],
+      enabled: true,
+      schedule: [],
+    },
+  ],
+};

.github/workflows/build.yml

@@ -0,0 +1,45 @@
+name: build
+
+on: [push, pull_request]
+
+jobs:
+  commitlint:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2.1.0
+        with:
+          fetch-depth: 0
+      - name: Lint commit messages
+        uses: wagoid/commitlint-github-action@v1.6.0
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2.1.0
+      - name: Setup node
+        uses: actions/setup-node@v1.4.1
+        with:
+          node-version: '12.x'
+      - name: Install project
+        run: npm ci
+      - name: Lint
+        run: npm run lint
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2.1.0
+      - name: Renovate test
+        uses: ./
+        with:
+          configurationFile: .github/config.js
+          token: ${{ secrets.RENOVATE_TOKEN }}
+
+  build:
+    needs: [lint, commitlint, test]
+    runs-on: ubuntu-latest
+    steps:
+      - run: echo 'Dummy'

.github/workflows/lint-commit-messages.yml

@@ -1,18 +0,0 @@
-name: Lint commit messages
-on:
-  push:
-    branches:
-      - master
-  pull_request:
-jobs:
-  commitlint:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v2.1.0
-        with:
-          fetch-depth: 0
-      - name: Lint commit messages
-        uses: wagoid/commitlint-github-action@v1.6.0
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/lint.yml

@@ -1,20 +0,0 @@
-name: Lint
-on:
-  push:
-    branches:
-      - master
-  pull_request:
-jobs:
-  lint:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v2.1.0
-      - name: Setup node
-        uses: actions/setup-node@v1.4.1
-        with:
-          node-version: '12.x'
-      - name: Install project
-        run: npm ci
-      - name: Lint
-        run: npm run lint