Ansible - Check if Shipyard is installed as a docker image, if not install it

shipyard-test.yml

    #
    # Block to install Shipyard onto docker_swarm_manager - if required
    #
    - block:
      - name: "Check if Shipyard is installed"
        shell: docker ps | grep -c "shipyard/shipyard"
        ignore_errors: yes
        become: no
        register: shipyard_test
      
      - debug: var=shipyard_test

      - debug: msg="success"
        when: shipyard_test|success
      
      - debug: msg="failed"
        #when: shipyard_test.failed == true
        when: shipyard_test|failed

      - name: "Install Shipyard on docker_swarm_manager"
        shell: curl -s https://shipyard-project.com/deploy | bash -s
        when: shipyard_test|failed

      when: "{{ inventory_hostname in groups['docker_swarm_manager'][0] }}"
      delegate_to: "{{ groups['docker_swarm_manager'][0] }}"

The block "when" only runs when the hostname matches the first name in the group
The delegate_to runs all commands on the first hostname in the group.
I use the "shell" module as i am piping the output into something else.
ignore_errors is used as grep will fail if it doesnt match and we need to know about that, rather than stop the play