ci: add CI using GitHub Actions

Signed-off-by: Pascal Vorwerk <info@fossores.de>

.github/workflows/package.yml

@@ -0,0 +1,21 @@
+name: Node.js CI
+
+on: [push]
+
+jobs:
+  build-and-publish:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    steps:
+      - uses: actions/checkout@v4
+      - name: Use Node.js
+        uses: actions/setup-node@v3
+        with:
+          node-version: "20.x"
+          registry-url: "https://npm.pkg.github.com/"
+      - run: npm ci
+      - run: npm publish
+        env:
+          NODE_AUTH_TOKEN: ${{ secrets.GITHUB_TOKEN }}