Add CI workflow

Signed-off-by: Florian Dupuy <florian.dupuy@rte-france.com>

.github/.workflows/maven.yml

@@ -0,0 +1,35 @@
+name: CI
+
+on: [push]
+
+jobs:
+  build:
+    name: Build OS ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest]
+
+    steps:
+      - name: Checkout sources
+        uses: actions/checkout@v2.3.4
+
+      - name: Set up JDK 11
+        uses: actions/setup-java@v2
+        with:
+          distribution: 'zulu'
+          java-version: 11
+
+      - name: Build with Maven
+        run: mvn --batch-mode -P jacoco,checks package
+
+      - name: Run SonarCloud analysis
+        if: matrix.os == 'ubuntu-latest'
+        run: >
+          mvn --batch-mode -Pjacoco verify sonar:sonar
+          -Dsonar.host.url=https://sonarcloud.io
+          -Dsonar.organization=powsybl-ci-github
+          -Dsonar.projectKey=com.powsybl:powsybl-network-area-diagram
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}