that's all folks

src/com/example/DockerBuilder.groovy

@@ -0,0 +1,42 @@
+package com.example
+
+class DockerBuilder {
+    def dockerBuildAndPush(String dockerRepo, String imageName, String dockerfilePath, String buildContext, String nexusUser, String nexusPass) {
+        container('docker') {
+            sh "dockerd --insecure-registry http://${dockerRepo} &"
+            echo "Started Docker daemon in container 'docker'"
+
+            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 customDockerBuildAndPush(String dockerRepo, String imageName, String dockerfilePath, String buildContext, String nexusUser, String nexusPass) {
+        container('custom-docker') {
+            sh "dockerd &"
+            echo "Started Docker daemon in container 'custom-docker'"
+
+            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}"
+
+        }
+    }
+}

vars/buildAndDeploy.groovy

@@ -1,4 +1,8 @@
-def call(String appName, String helmChartPath, String helmRepoName,String helmChartVersion, String dockerBuildFunction) {
+import com.example.DockerBuilder
+
+def call(String appName, String helmChartPath, String helmRepoName,String helmChartVersion, Boolean useCustomDocker) {
+    def dockerBuilder = new DockerBuilder()
+
     stage('Make jar') {
         script {
             buildJar(true)
@@ -16,7 +20,11 @@ def call(String appName, String helmChartPath, String helmRepoName,String helmCh
     }
     stage('Docker build & push') {
         script {
-            this."${dockerBuildFunction}"(env.NEXUS_DOCKER_URL, appName, "./Dockerfile", "target", "admin", env.NEXUS_DOCKER_PASS)
+            if (useCustomDocker) {
+                dockerBuilder.customDockerBuildAndPush(env.NEXUS_DOCKER_URL, appName, "./Dockerfile", "target", "admin", env.NEXUS_DOCKER_PASS)
+            } else {
+                dockerBuilder.dockerBuildAndPush(env.NEXUS_DOCKER_URL, appName, "./Dockerfile", "target", "admin", env.NEXUS_DOCKER_PASS)
+            }
         }
     }
     stage('Add Helm Repo') {