feat: add Jenkinsfile and modify Dockerfile.two

Dockerfile.two

@@ -4,9 +4,9 @@ WORKDIR /app
 
 COPY . .
 
-RUN ["mvn", "clean", "install"]
+RUN ["mvn", "clean", "install", "-DskipTests"]
 
-FROM eclipse-temurin
+FROM gcr.io/distroless/java21-debian12
 
 WORKDIR /app
 
@@ -14,6 +14,4 @@ COPY --from=builder /app/target/spring-petclinic-*.jar app.jar
 
 EXPOSE 8080
 
-ENTRYPOINT ["java","-jar","app.jar"]
-
-
+ENTRYPOINT ["java","-jar","app.jar"]

Jenkinsfile

@@ -0,0 +1,85 @@
+pipeline {
+    agent any
+
+    environment {
+        GIT_COMMIT_SHORT = sh(script: "git rev-parse --short HEAD", returnStdout: true).trim()
+    }
+
+    stages {
+        stage('Checkout') {
+            steps {
+                checkout scm
+            }
+        }
+
+        // === Merge Request (MR) jobs only ===
+        stage('Checkstyle') {
+            when {
+                expression { return env.CHANGE_ID != null }
+            }
+            steps {
+                sh 'mvn checkstyle:checkstyle'
+            }
+            post {
+                always {
+                    archiveArtifacts artifacts: 'target/checkstyle-result.xml', fingerprint: true
+                }
+            }
+        }
+
+        stage('Test') {
+            when {
+                expression { return env.CHANGE_ID != null }
+            }
+            steps {
+                sh 'mvn test'
+            }
+        }
+
+        stage('Build (no tests)') {
+            when {
+                expression { return env.CHANGE_ID != null }
+            }
+            steps {
+                sh 'mvn package -DskipTests'
+            }
+        }
+
+        // === Docker build and push for both MR and main ===
+        stage('Build & Push Docker Image') {
+            steps {
+                script {
+                    def isMR = env.CHANGE_ID != null
+
+                    // Define repo and tag based on context
+                    def repo = isMR ? "ggonzalezx/mr" : "ggonzalezx/main"
+
+                    def tag = isMR ? "${GIT_COMMIT_SHORT}" : "latest"
+
+                    def fullImageName = "${repo}:${tag}"
+
+                    echo "Building Docker image with Dockerfile.two: ${fullImageName}"
+
+                    // Build using Dockerfile.two
+                    docker.build(fullImageName, "-f Dockerfile.two .")
+
+                    // Authenticate and push to Docker Hub
+                    docker.withRegistry('https://index.docker.io/v1/', 'dockerhub-credentials') {
+                        docker.image(fullImageName).push()
+                    }
+
+                    echo "Docker image pushed to: https://hub.docker.com/repository/docker/${repo}"
+                }
+            }
+        }
+    }
+
+    post {
+        success {
+            echo "Pipeline SUCCESS for ${env.BRANCH_NAME} (${env.CHANGE_ID ?: 'not an MR'})"
+        }
+        failure {
+            echo "Pipeline FAILURE for ${env.BRANCH_NAME} (${env.CHANGE_ID ?: 'not an MR'})"
+        }
+    }
+}