Build and test matrix for all major java versions.

Author: Tyler Coles

.github/workflows/build.yml

@@ -9,14 +9,17 @@ on:
 
 jobs:
   build:
+    strategy:
+      matrix:
+        java: ['8', '11', '16', '17', '18']
     runs-on: ubuntu-latest
     steps:
     - name: Checkout code
       uses: actions/checkout@v3
     - name: Setup JDK
       uses: actions/setup-java@v3
       with:
-        java-version: '8'
+        java-version: ${{ matrix.java }}
         distribution: 'temurin'
         cache: maven
     - name: Build with Maven