Github Action workflow

.github/workflows/gradle.yml

@@ -0,0 +1,30 @@
+name: Java CI with Gradle
+
+on:
+  push:
+    branches: [ "master" ]
+  pull_request:
+    branches: [ "master" ]
+
+permissions:
+  contents: read
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+    - name: Set up JDK 8
+      uses: actions/setup-java@v3
+      with:
+        java-version: '8'
+        distribution: 'temurin'
+    - name: Build with Gradle
+      uses: gradle/gradle-build-action@0d13054264b0bb894ded474f08ebb30921341cee
+      with:
+        arguments: build
+    - name: Upload a Build Artifact
+      uses: actions/upload-artifact@v3.1.0
+      with:
+        name: rt4-client.jar
+        path: /client/build/libs/client-1.0.0.jar