Improve GitHub Actions PR workflow (#11845)

.github/workflows/markdown.yml

@@ -1,20 +0,0 @@
-name: Markdown
-
-on: [push, pull_request]
-
-jobs:
-  remark:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checking out files from GitHub
-        uses: actions/checkout@v1
-      - name: Use Node.js ${{ matrix.node-version }}
-        uses: actions/setup-node@v1
-        with:
-          node-version: 12.x
-      - name: Installing dependencies
-        run: npm install
-        env:
-          CI: true
-      - name: Running remark lint
-        run: npm run markdown:lint

.github/workflows/test.yml

@@ -0,0 +1,62 @@
+name: home-assistant.io Test
+
+on: [push, pull_request]
+
+jobs:
+  markdown-lint:
+    name: Lint Markdown
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out files from GitHub
+        uses: actions/checkout@v2
+      - name: Setting up Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v1
+        with:
+          node-version: 12.x
+      - name: Setup NPM cache
+        uses: actions/cache@v1
+        with:
+          path: ~/.npm
+          key: npm-${{ hashFiles('**/package-lock.json') }}
+          restore-keys: |
+            npm-
+      - name: Install dependencies
+        run: npm install
+        env:
+          CI: true
+      - name: Run remark lint
+        run: npm run markdown:lint
+  build:
+    name: Jekyll build
+    runs-on: ubuntu-latest
+    needs: [markdown-lint]
+    steps:
+      - name: Check out files from GitHub
+        uses: actions/checkout@v2
+      - name: Setting up Ruby 2.6
+        uses: actions/setup-ruby@v1
+        with:
+          ruby-version: 2.6
+      - name: Setup Ruby Gems cache
+        uses: actions/cache@v1
+        with:
+          path: vendor/bundle
+          key: gems-${{ hashFiles('**/Gemfile.lock') }}
+          restore-keys: |
+            gems-
+      - name: Installing dependencies
+        run: |
+          gem install bundler -v 2.0.1
+          bundle config path vendor/bundle
+          bundle install --jobs 4 --retry 3
+      - name: Setting up Jekyll cache
+        uses: actions/cache@v1
+        with:
+          path: source/.jekyll-cache
+          key: jekyll-${{ hashFiles('**/Gemfile.lock') }}-${{ hashFiles('**/_config.yml') }}
+          restore-keys: |
+            jekyll-${{ hashFiles('**/Gemfile.lock') }}-
+            jekyll-
+      - name: Building site
+        run: |
+          bundle exec rake generate