set up github actions

Author: tomix26

.github/workflows/maven.yml

@@ -0,0 +1,25 @@
+name: Java CI
+on: push
+jobs:
+  build:
+    name: Java ${{ matrix.java }}
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        java: [8, 11, 13]
+    steps:
+    - name: Checkout project
+      uses: actions/checkout@v1
+    - name: Set up JDK
+      uses: actions/setup-java@v1
+      with:
+        java-version: ${{ matrix.java }}
+    - name: Cache Maven repository
+      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: mvn -B test