Consolidate workflow

.github/workflows/maven.yml

@@ -1,17 +1,30 @@
-name: JDK8
+name: Atmopshere 3.x CI
 
-on: [push, pull_request]
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
 
 jobs:
   build:
-
     runs-on: ubuntu-latest
 
+    strategy:
+      matrix:
+        java-version: [18, 21]
+
     steps:
-    - uses: actions/checkout@v1
-    - name: Set up JDK 1.8
-      uses: actions/setup-java@v1
+    - uses: actions/checkout@v2
+
+    - name: Set up JDK ${{ matrix.java-version }}
+      uses: actions/setup-java@v2
       with:
-        java-version: 1.8
+        java-version: ${{ matrix.java-version }}
+        distribution: 'temurin'
+
     - name: Build with Maven
       run: mvn -B package --file pom.xml
+
+    - name: Test with Maven
+      run: mvn -B test --file pom.xml