prepare for GitHub actions

Author: zeng-github01

.github/workflows/build.yml

@@ -0,0 +1,21 @@
+name: Build
+
+on: [push]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up OpenJDK 17
+        uses: actions/setup-java@v4
+        with:
+          java-version: '17'
+          distribution: 'adopt' # You can choose other OpenJDK distributions.
+      - name: Build with Gradle
+        run: ./gradlew build # Ensure your gradlew script is executable
+      - name: Upload Artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: Re-Exposer
+          path: build/libs/*.jar # Make sure this path matches the location of your build artifacts