[CI] setup CI

Author: marmoure

.github/workflows/ci.yml

@@ -0,0 +1,20 @@
+name: CI
+on: [push, pull_request]
+jobs:
+  build:
+    name: Build
+    strategy:
+      fail-fast: false
+      matrix:
+        jdk: [ 21 ]
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up JDK ${{ matrix.jdk }}
+        uses: actions/setup-java@v4
+        with:
+          java-version: ${{ matrix.jdk }}
+          distribution: liberica
+          cache: maven
+      - name: Build with Maven
+        run: mvn -V -B package