fix: set up Java for backend in .yml file

.github/workflows/main.yml

@@ -12,10 +12,10 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: Set up Node.js for Frontend
-        uses: actions/setup-node@v2
+        uses: actions/setup-node@v4
         with:
           node-version: '20.17.0'
 
@@ -30,20 +30,22 @@ jobs:
           npm run build
 
       - name: Set up Java for Backend
-        uses: actions/setup-java@v2
+        uses: actions/setup-java@v4
         with:
           distribution: 'oracle'
           java-version: '22.0.2'
 
-      - name: Build Backend
+      - name: Build Backend with Maven
         run: |
           cd backend
-          mvnw package
+          mvn -B package --file pom.xml
+
 
   deploy:
+    needs: build
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - uses: akhileshns/[email protected]
         with:
           heroku_api_key: ${{secrets.HEROKU_API_KEY}}
@@ -56,4 +58,4 @@ jobs:
           heroku_api_key: ${{secrets.HEROKU_API_KEY}}
           heroku_app_name: ${{secrets.HEROKU_BACKEND_APP_NAME}}
           heroku_email: ${{secrets.HEROKU_EMAIL}}
-          appdir: "backend"
+          appdir: "backend"

backend/pom.xml

@@ -10,8 +10,8 @@
   <properties>
     <maven.compiler.release>11</maven.compiler.release>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-    <maven.compiler.source>1.8</maven.compiler.source>
-    <maven.compiler.target>1.8</maven.compiler.target>
+    <maven.compiler.source>11</maven.compiler.source>
+    <maven.compiler.target>11</maven.compiler.target>
 
     <version.io.quarkus>3.13.2</version.io.quarkus>
     <version.ai.timefold.solver>1.13.0</version.ai.timefold.solver>