Add multi-os workflow

Author: tortmayr

.github/workflows/ci.yml

@@ -0,0 +1,36 @@
+name: CI
+
+on:
+  pull_request:
+    branches:
+      - master
+  workflow_dispatch:
+
+jobs:
+  build:
+    name: Build and Test
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+        java-version: [17, 21]
+
+    steps:
+      - name: Setup Maven and Java
+        uses: s4u/setup-maven-action@2f53a7669c7543a045d0bb6c92436df0c5a726f8 #v1.14.0 
+        with:
+          java-distribution: "temurin"
+          java-version: ${{ matrix.java-version }}
+      - name: Build (P2)
+        run: mvn clean verify -Pp2 -B -Dcheckstyle.skip -DskipTests
+        shell: bash
+      - name: Build & Test (M2)
+        run: mvn clean verify -Pm2 -B -Dcheckstyle.skip
+        shell: bash
+      - name: Test Summary
+        uses: test-summary/action@31493c76ec9e7aa675f1585d3ed6f1da69269a86 # v2.4
+        with:
+            paths: "tests/**/surefire-reports/*.xml"
+        if: always()
+