workflows: add a job to build and test on macOS

Author: stephengold

.github/workflows/maven.yml

@@ -15,10 +15,26 @@ on:
     branches: [ "Overhaul" ]
 
 jobs:
-  build:
-
+  Linux:
     runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v7
+    - name: Set up JDK 26
+      uses: actions/setup-java@v5
+      with:
+        java-version: '26'
+        distribution: 'temurin'
+        cache: maven
+    - name: Build with Maven
+      run: mvn -B package --file pom.xml
+    - name: Execute the HelloWorld app
+      run: |
+        $JAVA_HOME/bin/java --enable-preview --enable-native-access=ALL-UNNAMED \
+          -cp target/JoltPhysics-JavaFFM-5.5.0-jar-with-dependencies.jar \
+          volucris.bindings.jolt.HelloWorld
 
+  macOS:
+    runs-on: macos-26
     steps:
     - uses: actions/checkout@v7
     - name: Set up JDK 26