Method to pull latest goss release, not hard-coded release

[Halfwalker]

Right now the goss release to be pulled in the verify.yml is hard-coded to 0.3.16

molecule_goss/cookiecutter/{{cookiecutter.molecule_directory}}/{{cookiecutter.scenario_name}}/verify.yml

---                                                                                                                                                                           
{% raw -%}                                                                                                                                                                    
- name: Verify                                                                                                                                                                
  hosts: all                                                                                                                                                                  
  become: true                                                                                                                                                                
  vars:                                                                                                                                                                       
    goss_version: v0.3.16                                                                                                                                                     
    goss_arch: amd64                                                                                                                                                          
    goss_bin: /usr/local/bin/goss                                                                                                                                             
    goss_sha256sum: 827e354b48f93bce933f5efcd1f00dc82569c42a179cf2d384b040d8a80bfbfb.                                                                                         
    goss_test_directory: /tmp/molecule/goss                                                                                                                                   
    goss_format: documentation                                                                                                                                                
    goss_vars: "{{ goss_test_directory }}/vars"                                                                                                                               
    copy_defaults_vars: false                                                                                                                                                 
  tasks:                                                                                                                                                                      
    - name: Download and install Goss                                                                                                                                         
      get_url:                                                                                                                                                                
        url: "https://github.com/aelsabbahy/goss/releases/download/{{ goss_version }}/goss-linux-{{ goss_arch }}"                                                             
        dest: "{{ goss_bin }}"                                                                                                                                                
        checksum: "sha256:{{ goss_sha256sum }}"                                                                                                                               
        mode: 0755                                                                                                                                                            

A cleaner method would be to find the latest release from the goss repo and pull that down. For example, this is a method I use a lot in my ansible stuff

# https://github.com/aelsabbahy/goss/releases/download/v0.3.16/goss-linux-amd64
# https://github.com/aelsabbahy/goss/releases/download/v0.3.16/goss-linux-amd64.sha256

- name: Get latest release
  uri:
    url: "https://api.github.com/repos/aelsabbahy/goss/releases/latest"
    method: GET
    return_content: true
    status_code: 200
    body_format: json
    validate_certs: false
    user: "{{ lookup('env', 'GH_USER') | default(omit) }}"
    password: "{{ lookup('env', 'GH_TOKEN') | default(omit) }}"
  register: _latest_release
  until: _latest_release.status == 200
  retries: 5

- name: "Set goss_version to {{ _latest_release.json.tag_name[1:] }}"
  set_fact:
    goss_version: "{{ _latest_release.json.tag_name[1:] }}"
  when: _latest_release is defined

# Can do some magic here to handle multiple architectures
- name: Get checksum for amd64
  set_fact:
    goss_checksum: "{{ item.split(' ')[0] }}"
  with_items:
    - "{{ lookup('url', 'https://github.com/aelsabbahy/goss/releases/download/v' + goss_version + '/goss-linux-amd64.sha256', wantlist=True) | list }}"

- name: Download and install Goss
   get_url:
     url: "https://github.com/aelsabbahy/goss/releases/download/{{ goss_version }}/goss-linux-{{ goss_arch }}"
     dest: "{{ goss_bin }}"
     checksum: "sha256:{{ goss_sha256sum }}"
     mode: 0755

Here's a sample run

PLAY [all] ******************************

TASK [Gathering Facts] ******************
ok: [test2.local]

TASK [Get latest release] ***************
ok: [test2.local]

TASK [Set goss_version to 0.3.16] *******
ok: [test2.local]

TASK [Get checksum for amd64] ***********
ok: [test2.local] => (item=827e354b48f93bce933f5efcd1f00dc82569c42a179cf2d384b040d8a80bfbfb goss-linux-amd64)

TASK [debug] ****************************
ok: [test2.local] =>
goss_version: 0.3.16

TASK [debug] ****************************
ok: [test2.local] =>
goss_checksum: 827e354b48f93bce933f5efcd1f00dc82569c42a179cf2d384b040d8a80bfbfb

[abtreece]

Nice @Halfwalker

It seems like we should allow for specifying a version in vars, otherwise we default to latest.