更新 'Jenkinsfile'

Jenkinsfile

@@ -9,9 +9,9 @@ pipeline {
         }
         stage('Build') {
             steps {
-                echo 'Building.. $((${BUILD_NUMBER}-1))'
+                echo 'Building..'
                 sh 'docker-compose down'
-                sh 'docker rmi master:$((${BUILD_NUMBER}-1))'
+                sh 'docker images master:$((${BUILD_NUMBER}-1)) grep master && docker rmi master:$((${BUILD_NUMBER}-1))'
                 sh '~/tools/apache-maven-3.6.3/bin/mvn  clean install -Dmaven.test.skip=true'
                 sh 'docker build -t master:${BUILD_NUMBER} .'
             }