---
name: Java CI

on: [push]

jobs:
  test:
    runs-on: ${{ matrix.os }}
    strategy:
      matrix:
        os: [ubuntu-18.04]
        java: [8, 11]
      fail-fast: false
      max-parallel: 4
    name: Test JDK ${{ matrix.java }}, ${{ matrix.os }}

    steps:
      - uses: actions/checkout@v2
      - name: Set up JDK
        uses: actions/setup-java@v1
        with:
          java-version: ${{ matrix.java }}
      - name: Grant execute permission for gradlew
        run: chmod +x gradlew
      - name: Build with Gradle
        run: ./gradlew build

...