add build action

Author: ix0rai

.github/workflows/build.yml

@@ -0,0 +1,24 @@
+name: build
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v3
+      - name: set up JDK 21
+        uses: actions/setup-java@v3
+        with:
+          distribution: 'temurin'
+          java-version: '21'
+      - name: grant execute permission for gradlew
+        run: chmod +x gradlew
+      - name: build with gradle
+        run: ./gradlew build
+      - name: capture build artifacts
+        uses: actions/upload-artifact@v3
+        with:
+          name: artifacts
+          path: build/libs/