I am sorry

src/com/example/DockerBuilder.groovy

@@ -1,22 +1,15 @@
 package com.example
 
 class DockerBuilder {
-    def dockerBuildAndPush(String dockerRepo, String imageName, String dockerfilePath, String buildContext, String nexusUser, String nexusPass, Boolean useInsecureRegistry) {
-        def dockerdCommand = useInsecureRegistry ? "dockerd --insecure-registry http://${dockerRepo} &" : "dockerd &"
-
-        sh "$dockerdCommand"
-        echo "Started Docker daemon${useInsecureRegistry ? ' with --insecure-registry' : ''}"
-
-        sh "docker build -t ${imageName} -f ${dockerfilePath} ${buildContext}"
-        echo "Docker image ${imageName} built"
-
-        sh "docker login http://${dockerRepo} -u ${nexusUser} -p ${nexusPass}"
-        echo "Logged in to ${dockerRepo}"
-
-        sh "docker tag ${imageName} ${dockerRepo}/my-docker-repo/${imageName}:latest"
-        echo "Image ${imageName} tagged"
-
-        sh "docker push ${dockerRepo}/my-docker-repo/${imageName}:latest"
-        echo "Pushed Docker image ${imageName} to ${dockerRepo}"
+    def getDockerdCommand(String dockerRepo, Boolean useInsecureRegistry) {
+        return useInsecureRegistry ? "dockerd --insecure-registry http://${dockerRepo} &" : "dockerd &"
+    }
+    def getDockerBuildCommands(String dockerRepo, String imageName, String dockerfilePath, String buildContext, String nexusUser, String nexusPass) {
+        return [
+            "docker build -t ${imageName} -f ${dockerfilePath} ${buildContext}",
+            "docker login http://${dockerRepo} -u ${nexusUser} -p ${nexusPass}",
+            "docker tag ${imageName} ${dockerRepo}/my-docker-repo/${imageName}:latest",
+            "docker push ${dockerRepo}/my-docker-repo/${imageName}:latest"
+        ]
     }
 }

vars/buildAndDeploy.groovy

@@ -22,15 +22,17 @@ def call(String appName, String helmChartPath, String helmRepoName,String helmCh
     stage('Docker build & push') {
         container(containerName) {
             script {
-                dockerBuilder.dockerBuildAndPush(
+                sh dockerBuilder.getDockerdCommand(env.NEXUS_DOCKER_URL, useInsecureRegistry)
+                sh dockerBuilder.getDockerBuildCommands(
                     env.NEXUS_DOCKER_URL,
                     appName,
                     "./Dockerfile",
                     "target",
                     "admin",
-                    env.NEXUS_DOCKER_PASS,
-                    useInsecureRegistry
-                )
+                    env.NEXUS_DOCKER_PASS
+                ).each { cmd ->
+                    sh cmd
+                }
             }
         }
     }