Update maven.yml

Try build docker and push to docker hub

Author: Allen-Chen-BU

.github/workflows/maven.yml

@@ -6,15 +6,18 @@
 # separate terms of service, privacy policy, and support
 # documentation.
 
+# Action name
 name: Java CI with Maven
 
+# When will the action run
 on:
   push:
     branches: [ "testGitHub-Action" ]
   pull_request:
     branches: [ "testGitHub-Action" ]
 
 jobs:
+  # build the project
   build:
 
     runs-on: ubuntu-latest
@@ -30,10 +33,34 @@ jobs:
         java-version: '17'
         distribution: 'temurin'
         cache: maven
+        
     - name: Build with Maven
       run: mvn clean package --file pom.xml
-    - name: Upload artifact
-      uses: actions/upload-artifact@v4
-      with:
-        name: bu-secondhand-1.0.0
-        path: ./code/backend/target/bu-secondhand-1.0.0.jar
+      
+    # - name: Upload artifact
+    #   uses: actions/upload-artifact@v4
+    #   with:
+    #     name: bu-secondhand-1.0.0
+    #     path: ./code/backend/target/bu-secondhand-1.0.0.jar
+
+  # build a docker image and push it to Docker Hub
+  deploy:
+    runs-on: ubuntu-latest
+    defaults:
+      run: 
+        working-directory: ./code/backend
+    steps:
+      - name: Login to Docker Hub
+        uses: docker/login-action@v3
+        with:
+          username: ${{ vars.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+          
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+        
+      - name: Build and push
+        uses: docker/build-push-action@v6
+        with:
+          push: true
+          tags: ${{ vars.DOCKERHUB_USERNAME }}/campus_exchange:latest