Docker Build pipeline without tag

def imageName="192.168.44.44:8082/docker_registry/frontend"

pipeline {
    agent {
        label 'agent'
    }

    environment {
        PIP_BREAK_SYSTEM_PACKAGES = 1
        scannerHome = tool 'SonarQube'
    }

    stages {
        stage('Get Code') {
            steps {
                git branch: 'jenkinsfile', url: 'https://github.com/Panda-Academy-Core-2-0/Frontend'
            }
        }

        stage('Unit tests') {
            steps {
                sh "pip3 install -r requirements.txt"
                sh "python3 -m pytest --cov=. --cov-report xml:test-results/coverage.xml --junitxml=test-results/pytest-report.xml"
            }
        }

        stage('Sonarqube analysis') {
            steps {
                withSonarQubeEnv('SonarQube') {
                    sh "${scannerHome}/bin/sonar-scanner"
                }
            }
        }

        stage('Build application image') {
            steps {
                script {
                  applicationImage = docker.build("$imageName")
                }
            }
        }
    }
}