ci: create CI

Author: vbetsch

.github/workflows/ci.yml

@@ -0,0 +1,23 @@
+name: CI
+
+on:
+  push:
+
+jobs:
+  test:
+    name: Build and Test
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v7
+
+      - name: Set up JDK
+        uses: actions/setup-java@v5
+        with:
+          distribution: 'temurin'
+          java-version: '26'
+          cache: 'maven'
+
+      - name: Run tests
+        run: mvn -B test