remove duplication from deploy

roles/deploy/tasks/rollback.yml

@@ -0,0 +1,21 @@
+---
+
+- name: get running container
+  shell: docker ps -a|grep {{ container_name }}|grep latest| awk '{print $1}'
+  register: current_container_id
+
+- name: kill old version
+  shell: docker stop {{ container_name }}
+  when: current_container_id != ""
+
+- name: get old containers
+  shell: docker ps -a|grep Exited| awk '{print $1}'
+  register: old_containers
+
+- name: clean old containers
+  shell: docker rm $(docker ps -a|grep Exited| awk '{print $1}')
+  when: old_containers.stdout != ""
+
+- name: Start the container
+  shell: docker run -d --name {{ container_name }} {{ container_name }}:old
+