Add check if repository is already installed

[e-alfred]

Hello,

if I run the playbook again on a host, the repository is added again everytime, resulting in duplicate entry warnings (Debian). Maybe there should be some check for that?

Thank you

[aarnaud]

ansible already did do that when the task use apt_repository. I haven't this behavior

[dj-wasabi]

With #11 this should be validated. Until then I keep this issue open.

[dj-wasabi]

I close this issue, as Molecule is used for testing this role now. One of the actions in this test is the idempotence check. It hasn't failed so the task is idempotent.