feat(workflow): Add GitHub Actions workflow for pull requests

This commit adds a new GitHub Actions workflow, defined in `.github/workflows/pull-request.yml`, that gets triggered on pull requests. The workflow includes linting and test jobs that run on the latest Ubuntu and Node 20 environment.

.github/workflows/pull-request.yml

@@ -0,0 +1,29 @@
+name: Pull Request Checks
+
+on:
+  pull_request:
+    types: [opened,synchronize]
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 20
+      - run: npm ci
+      - run: npm run lint
+
+  test:
+    needs: lint
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 20
+      - run: npm ci
+      - run: npm test
+        env:
+          NODE_ENV: production