Update maven.yml

Author: Allen-Chen-BU

.github/workflows/maven.yml

@@ -54,7 +54,7 @@ jobs:
       - uses: actions/download-artifact@v4
         with:
           name: bu-secondhand-1.0.0
-          path: ./target/bu-secondhand-1.0.0.jar
+          path: ./code/backend/target/bu-secondhand-1.0.0.jar
 
       - name: Login to Docker Hub
         uses: docker/login-action@v3
@@ -68,7 +68,7 @@ jobs:
       - name: Build and push
         uses: docker/build-push-action@v6
         with:
-          context: ./code
-          file: code/backend/Dockerfile
+          context: ./code/backend/
+          file: ./code/backend/Dockerfile
           push: true
           tags: campus_exchange:latest