Update .gitlab-ci.yml file

.gitlab-ci.yml

@@ -5,9 +5,56 @@
 # 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: maven:3.9.0-jdk-21
+
+services:
+  - docker:20.10.16-dind
+
 stages:
-- test
-sast:
-  stage: test
-include:
-- template: Security/SAST.gitlab-ci.yml
+  - build
+  - docker
+
+variables:
+  DOCKER_HOST: tcp://docker:2375
+  DOCKER_TLS_CERTDIR: ""
+  DOCKER_IMAGE: hftstuttgart/cota-backend
+  DOCKER_TAG: test
+  BUILD_NUMBER: "$CI_PIPELINE_ID"
+
+before_script:
+  - echo "🔍 Checking Docker setup..."
+  - docker version
+  - until docker info > /dev/null 2>&1; do echo "Waiting for Docker daemon..."; sleep 3; done
+  - echo "🧱 Maven and Java versions:"
+  - mvn -v
+  - java -version
+
+# ----------------------------
+# Stage 1: Build Maven project
+# ----------------------------
+build_backend:
+  stage: build
+  script:
+    - echo "⚙️ Building backend with Maven..."
+    - mvn clean install -DskipTests=true -B
+    - echo "✅ Maven build complete. JARs generated in target/."
+  artifacts:
+    paths:
+      - target/*.jar
+    expire_in: 1 hour
+
+# ----------------------------
+# Stage 2: Build Docker image (no push)
+# ----------------------------
+docker_build_test:
+  stage: docker
+  needs: [build_backend]
+  script:
+    - echo "🐳 Building Docker image locally..."
+    - docker build --build-arg BUILD_NUMBER=$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)
+  only:
+    changes:
+      - '**/*'
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