Create build.yml

.github/workflows/build.yml

@@ -0,0 +1,23 @@
+name: Build
+
+on: workflow_dispatch
+#   push:
+#     branches: [ master ]
+#   pull_request:
+#     branches: [ master ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: set up JDK 1.8
+      uses: actions/setup-java@v1
+      with:
+        java-version: 1.8
+    - name: Grant execute permission for gradlew
+      run: chmod +x gradlew
+    - name: Build with Gradle
+      run: ./gradlew build