Adding pushes to dockerhub

Jenkinsfile

@@ -10,5 +10,12 @@ node {
   stage 'Tests'
 
     sh '/usr/local/bin/bats tests/base.bats'
+
+  stage 'Push'
+
+    docker.withRegistry('https://registry.hub.docker.com/', 'dockerhub-bigfleet') {
+      def baseImg = docker.build('bigfleet/centos7base')
+      baseImg.push('latest')
+    }
 
 }