Use Github Actions for build #362

Use Github actions to check whether the build runs on all OS.

.github/workflows/build.yml

@@ -0,0 +1,28 @@
+name: CI
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    strategy:
+      matrix:
+        os:
+          - ubuntu-latest
+          - macos-latest
+          - windows-latest
+        java_version:
+          - 11
+
+    runs-on: ${{ matrix.os }}
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Set up Java
+        uses: actions/setup-java@v1
+        with:
+          java-version: ${{ matrix.java_version }}
+      - name: Build
+        uses: eskatos/gradle-command-action@v1
+        with:
+          arguments: build -PallTests