Add a CI workflow for testing the extension

Author: nberth

.github/workflows/ci.yml

@@ -0,0 +1,31 @@
+name: Run VSCode Extension Tests
+
+on:
+  push:
+    branches:
+      - superbol-vscode-debug
+  pull_request:
+    branches:
+      - superbol-vscode-debug
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      - name: Setup Node.js environment
+        uses: actions/setup-node@v6
+        with:
+           node-version-file: 'package.json'
+
+      - name: Install dependencies
+        run: npm install
+
+      - name: Compile
+        run: npm run compile
+
+      - name: Run tests
+        run: xvfb-run -a npm test
+        if: runner.os == 'Linux'