Update .gitlab-ci.yml file

.gitlab-ci.yml

@@ -5,57 +5,44 @@
 # Container Scanning customization: https://docs.gitlab.com/ee/user/application_security/container_scanning/#customizing-the-container-scanning-settings
 # Note that environment variables can be set in several places
 # See https://docs.gitlab.com/ee/ci/variables/#cicd-variable-precedence
-image: eclipse-temurin:21-jdk
-
-services:
-  - docker:20.10.16-dind
-
 stages:
   - build
   - docker
 
 variables:
-  DOCKER_HOST: tcp://docker:2375
-  DOCKER_TLS_CERTDIR: ""
-  DOCKER_IMAGE: hftstuttgart/cota-backend
-  DOCKER_TAG: test
-  BUILD_NUMBER: "$CI_PIPELINE_ID"
-
-before_script:
-  - echo "🔍 Checking Docker setup..."
-  - apt-get update && apt-get install -y maven curl jq git
-  - docker version
-  - until docker info > /dev/null 2>&1; do echo "Waiting for Docker daemon..."; sleep 3; done
-  - echo "🧱 Maven and Java versions:"
-  - mvn -v
-  - java -version
+  BUILD_NUMBER: "${CI_PIPELINE_ID:-1}"
+  DOCKER_IMAGE: "cota-backend"
+  DOCKER_TAG: "test"
 
-# ----------------------------
-# Stage 1: Build Maven project
-# ----------------------------
 build_backend:
+  image: maven:3.9.9-eclipse-temurin-17
   stage: build
   script:
-    - echo "⚙️ Building backend with Maven..."
-    - mvn clean install -DskipTests=true -B
-    - echo "✅ Maven build complete. JARs generated in target/."
+    - echo "🔧 Building backend JAR with Maven..."
+    - mvn -B clean install
+    - echo "✅ Maven build done."
   artifacts:
     paths:
       - target/*.jar
     expire_in: 1 hour
 
-# ----------------------------
-# Stage 2: Build Docker image (no push)
-# ----------------------------
 docker_build_test:
+  image: docker:24.0.5
   stage: docker
+  services:
+    - docker:24.0.5-dind
+  variables:
+    DOCKER_HOST: tcp://docker:2375
+    DOCKER_TLS_CERTDIR: ""
   needs: [build_backend]
   script:
+    - echo "🐳 Waiting for Docker daemon..."
+    - until docker info > /dev/null 2>&1; do echo "⏳ Waiting..."; sleep 3; done
     - echo "🐳 Building Docker image locally..."
     - docker build --build-arg BUILD_NUMBER=$BUILD_NUMBER -t $DOCKER_IMAGE:$DOCKER_TAG .
     - echo "✅ Docker image build complete."
     - echo "🔍 Listing local Docker images:"
-    - docker images | grep cota-backend || (echo "❌ Image not found, build failed." && exit 1)
+    - docker images | grep $DOCKER_IMAGE || (echo "❌ Image not found, build failed." && exit 1)
   only:
     changes:
-      - '**/*'
+      - '**/*'
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