enable GitHub Actions CI workflow

Signed-off-by: sullis <[email protected]>

Author: sullis

Diff for: .github/workflows/ci.yml

@@ -0,0 +1,26 @@
+name: CI
+
+on:
+  pull_request_target:
+    branches:
+      - main
+  push:
+    branches:
+      - main
+
+jobs:
+  build:
+    strategy:
+      matrix:
+        java: [ '8', '16' ]
+        os: [ 'ubuntu-latest' ]
+    runs-on: ${{ matrix.os }}
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up JDK
+      uses: actions/setup-java@v2
+      with:
+        java-version: ${{ matrix.java }}
+        distribution: 'zulu'
+    - name: Maven build
+      run: mvn --no-transfer-progress -B clean test