ci: build dependencies before running deno tests

Author: mrstork

.github/workflows/deno-test.yml

@@ -9,11 +9,21 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
 
+      - name: 'Install Node'
+        uses: actions/setup-node@v4
+        with:
+          node-version: '18.x'
+          cache: 'npm'
+          cache-dependency-path: '**/package-lock.json'
+
       - name: Setup Deno
         uses: denoland/setup-deno@v1
         with:
           deno-version: v2.2.4
 
+      - name: 'Install dependencies'
+        run: npm ci
+
       - name: Vendor Deno modules
         run: deno --allow-import edge-runtime/vendor.ts