totally more readable

Dockerfile

@@ -0,0 +1,7 @@
+FROM docker:dind
+
+CMD ["sh", "-c", "
+dockerd --insecure-registry nexus-repo-nexus-repository-manager.default.svc.cluster.local:5000 &
+sleep 5
+docker login http://nexus-repo-nexus-repository-manager.default.svc.cluster.local:5000 -u admin -p testpass
+"]

Jenkinsfile

@@ -0,0 +1,78 @@
+@Library('my-shared-library@main') _
+
+pipeline {
+    agent {
+        kubernetes {
+            yaml """
+apiVersion: v1
+kind: Pod
+metadata:
+  name: default
+  namespace: default
+  labels:
+    jenkins-server-jenkins-agent: "true"
+spec:
+  containers:
+    - name: jnlp
+      image: jenkins/inbound-agent:3309.v27b_9314fd1a_4-2
+      workingDir: /home/jenkins/agent
+      env:
+        - name: JENKINS_URL
+          value: "http://jenkins-server.default.svc.cluster.local:8080/"
+      resources:
+        requests:
+          cpu: "512m"
+          memory: "512Mi"
+        limits:
+          cpu: "512m"
+          memory: "512Mi"
+
+    - name: docker
+      image: docker:dind
+      workingDir: /home/jenkins/agent
+      command: ["/bin/sh", "-c"]
+      args: ["sleep 9999999"]
+      securityContext:
+        privileged: true
+      env:
+        - name: NEXUS_DOCKER_URL
+          value: "nexus-repo-nexus-repository-manager.default.svc.cluster.local:5000"
+        - name: NEXUS_DOCKER_PASS
+          value: "testpass"
+
+  restartPolicy: Never
+  serviceAccountName: jenkins-server
+  volumes:
+    - emptyDir: {}
+      name: workspace-volume
+"""
+        }
+    }
+    stages{
+        stage('Retrieve docker Environment Variables') {
+            steps {
+                container('docker') {
+                    script {
+                        env.NEXUS_DOCKER_URL = sh(script: 'echo $NEXUS_DOCKER_URL', returnStdout: true).trim()
+                        env.NEXUS_DOCKER_PASS = sh(script: 'echo $NEXUS_DOCKER_PASS', returnStdout: true).trim()
+                    }
+                }
+            }
+        }
+        stage('Docker build & push') {
+            steps {
+                script {
+                    dockerBuildAndPush(env.NEXUS_DOCKER_URL, "custom-dind", "./Dockerfile", ".", "admin", env.NEXUS_DOCKER_PASS)
+                }
+            }
+        }
+    }
+    post {
+        success {
+            echo 'Custom Docker DIND build Successful'
+        }
+        failure {
+            echo 'Custom Docker DIND build Failed'
+        }
+    }
+}