ci: polyfill job

.github/workflows/test-js-polyfill.yml

@@ -0,0 +1,21 @@
+name: Run JS tests with polyfill
+on:
+  - push
+  - pull_request
+jobs:
+  node_polyfill: Node v${{ matrix.node }}
+    runs-on: ubuntu-24.04-arm
+    strategy:
+      matrix:
+        node: [18.20.5, 20.18.1, 22.13.0] # LTS on Jan 2025. Hardcoded is more secure
+    steps:
+      - uses: actions/checkout@1e31de5234b9f8995739874a8ce0492dc87873e2 # v4
+      - name: Use Node.js ${{ matrix.node }}
+        uses: actions/setup-node@8f152de45cc393bb48ce5d89d36b731f54556e65 # v4
+        with:
+          registry-url: "https://registry.npmjs.org"
+          cache: npm
+          node-version: ${{ matrix.node }}
+      - run: npm install
+      - run: npm run build --if-present
+      - run: npm run test:webcrypto