Added Jenkinsfile with Build/Push

Jenkinsfile

@@ -0,0 +1,42 @@
+#!groovy
+
+pipeline {
+    agent none
+
+    stages {
+        stage('Build/Push Docker Image') {
+            when {
+                beforeAgent true;
+                branch 'main'
+            }
+            agent {
+                label 'linux'
+            }
+            environment {
+                DOCKER_HUB_CREDENTIALS = credentials('docker-hub-fah16145')
+            }
+            stages {
+                stage('Build') {
+                    steps {
+                        sh 'docker build -t fah16145/jenkins-ssh-docker-agent:latest .'
+                    }
+                }
+                stage('Login') {
+                    steps {
+                        sh 'docker login -u ${DOCKER_HUB_CREDENTIALS_USR} -p ${DOCKER_HUB_CREDENTIALS_PSW}'
+                    }
+                }
+                stage('Push') {
+                    steps {
+                        sh 'docker push fah16145/jenkins-ssh-docker-agent:latest'
+                    }
+                }
+            }
+            post {
+                always {
+                    sh 'docker logout'
+                }
+            }
+        }
+    }
+}