Add pipeline

.github/workflows/pipeline.yml

@@ -0,0 +1,18 @@
+name: Build
+
+on:
+  push:
+    branches: [ "main" ]
+
+jobs:
+  jar:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-java@v4
+        with:
+          java-version: "22"
+          distribution: "temurin"
+          cache: "gradle"
+      - name: Build JAR
+        run: ./gradlew build