chore(project): add github workflow as CI of Javascript sources

related to camunda/camunda-bpm-platform#2781

.github/workflows/ci.yml

@@ -0,0 +1,19 @@
+name: Continuous integration (node-js code)
+
+on: [push]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Use Node.js
+        uses: actions/setup-node@v3
+        with:
+          node-version: '18.x'
+      - run: npm ci
+        working-directory: common
+      - run: npm run build
+        working-directory: common
+      - run: npm test
+        working-directory: common