Add filename option to apt repository add

[kaysond]

Addresses #335 and #101 (i.e. I'd say it's technically a work around as opposed to a solution)

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[kaysond]

Not stale

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This issue is no longer marked for closure.

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This pull request has been marked 'stale' due to lack of recent activity. If there is no further activity, the PR will be closed in another 30 days. Thank you for your contribution!

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[kaysond]

not stale (unless superseded by #369)

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This issue is no longer marked for closure.

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This pull request has been marked 'stale' due to lack of recent activity. If there is no further activity, the PR will be closed in another 30 days. Thank you for your contribution!

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[kaysond]

not stale

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[dsegurag]

@geerlingguy, @kaysond what if we add something like filename: "{{ docker_apt_filename | default(omit) }}", and we don't need to set anything under "default" folder:

- name: Add Docker repository.
  apt_repository:
    repo: "{{ docker_apt_repository }}"
    filename: "{{ docker_apt_filename | default(omit) }}"
    state: present
    update_cache: true
  when: docker_add_repo | bool

It's backward compatible with the current code. For next major version we can set a name (maybe "docker") for the file, but meanwhile people can start changing it to the desired name.

[kaysond]

Superseded by #369