Add GitHub Actions workflow for running tests

Author: joschi

.github/workflows/maven.yml

@@ -0,0 +1,33 @@
+name: Test
+on:
+  push:
+    branches:
+    - master
+  pull_request:
+    branches:
+    - master
+jobs:
+  build:
+    runs-on: 'ubuntu-latest'
+    strategy:
+      fail-fast: false
+      matrix:
+        java_version: ['8', '11', '14']
+    env:
+      JAVA_OPTS: "-XX:+TieredCompilation -XX:TieredStopAtLevel=1"
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up JDK
+      uses: joschi/setup-jdk@v1
+      with:
+        java-version: ${{ matrix.java_version }}
+    - uses: actions/cache@v1
+      with:
+        path: ~/.m2/repository
+        key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}
+        restore-keys: |
+          ${{ runner.os }}-maven-
+    - name: Build with Maven
+      run: ./mvnw -V -B -ff install '-DskipTests=true' '-Dmaven.javadoc.skip=true'
+    - name: Run tests
+      run: ./mvnw -V -B -ff verify