Add nodejs to workflow

.github/workflows/sanity.yml

@@ -15,21 +15,28 @@ jobs:
 
     steps:
       - uses: actions/checkout@v1
+      - name: Set up Node
+        uses: actions/setup-node@v1
+        with:
+          node-version: "12"
       - name: Set up Ruby 2.x
         uses: actions/setup-ruby@v1
         with:
           ruby-version: 2.x
+      - name: Set up Bundler
+        run: |
+          gem install bundler
+          bundle config set without 'uart'
+          bundle install --retry 3
+      - name: Set up Prettier
+        run: |
+          npm install prettier
       - name: Set up Rust nightly
         run: |
           rustup self update
           rustup toolchain install nightly --component rustfmt clippy
           rustup default nightly
           rustup target add aarch64-unknown-none-softfloat
-      - name: Set up Ruby
-        run: |
-          gem install bundler
-          bundle config set without 'uart'
-          bundle install --retry 3
       - name: Setup misspell
         run: |
           curl -L -o ./install-misspell.sh https://git.io/misspell