Replace Travis with GitHub Actions (#4)

* Replace Travis with GitHub Actions

* Refine workflow triggers

* Remove Coveralls dependency and script

* Enable dependency caching

* Disable caching since it conflicts with multiple Node versions

.github/workflows/ci.yaml

@@ -0,0 +1,27 @@
+name: Node.js CI
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: ['18.x', '20.x', '22.x']
+
+    steps:
+      - uses: actions/checkout@v4
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v4
+        with:
+          node-version: ${{ matrix.node-version }}
+      - run: npm ci
+      - run: npm run build
+      - run: npm run build:types
+      - run: npm run test
+      - run: npm run test:typescript