Try new way of installing deps in GA

.github/workflows/main.yml

@@ -9,8 +9,20 @@ jobs:
   run-checks-and-tests:
     runs-on: ubuntu-latest
     steps:
-      - name: Checkout
-        uses: actions/checkout@v2
+      - uses: actions/checkout@v2
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v2
+        with:
+          node-version-file: ".nvmrc"
+
+      - name: Cache dependencies
+        uses: actions/cache@v2
+        with:
+          path: ~/.npm
+          key: npm-${{ hashFiles('package-lock.json') }}
+          restore-keys: npm-
+
       - name: Prettier
         run: npm run prettier:check
       - name: Lint TS