更新 'Jenkinsfile'

Jenkinsfile

@@ -11,7 +11,7 @@ pipeline {
             steps {
                 echo 'Building..'
                 sh 'docker-compose down'
-                sh 'docker rmi master:0.1'
+                sh '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} .'
             }