Update maven.yml

Staging Jar

Author: Allen-Chen-BU

.github/workflows/maven.yml

@@ -32,3 +32,8 @@ jobs:
         cache: maven
     - name: Build with Maven
       run: mvn -B package --file pom.xml
+    - run: mkdir staging && cp target/*.jar staging
+    - uses: actions/upload-artifact@v4
+      with:
+        name: Package
+        path: staging