Add node setup steps

.github/workflows/unreleaseChangesCheck.yml

@@ -6,6 +6,16 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
+      - uses: actions/checkout@v2
+      - name: Use Node.js
+        uses: actions/setup-node@v2
+        with:
+          node-version: 18.x
+      - name: Install Yarn
+        run: npm install -g yarn
+      - name: Install deps
+        run: |
+          yarn install
       - uses: actions/checkout@v4
         with:
           # Always checkout the main branch