I want to create the jenkins file

jenkinsfile

@@ -0,0 +1,21 @@
+node {
+   def commit_id
+   stage('Preparation') {
+     checkout scm
+     sh "git rev-parse --short HEAD > .git/commit-id"                        
+     commit_id = readFile('.git/commit-id').trim()
+   }
+
+   stage('docker build/push') {
+     docker.withRegistry('https://index.docker.io/v2/', 'dockerhub') {
+       def app = docker.build("yugant1/docker-nodejs-demo", '.').push()
+     }
+   }
+   stage('deploy')  {
+       sh """
+       docker run -p 3000:3000 -d --name my-nodejs-app yugant1/docker-nodejs-demo
+       """
+
+     }
+
+}