This change further changes the name of the only host in question form
localhost to "127.0.0.1" to resolve the annoying warning about the
duplicated declaration of "localhost" at the start of the execution of
the playbook.
Here we start to have some delicate secrets in the code. Therefore I
need a vault for ansible. This vault contains the tokens to upload
ssh-keys to github and my lovely gitea server.
Note, that this change also adds a `requirements.yml`, this is necessary
because I use the paramater "api_url" of the github_key resource which
was only added in v11, but the debian ansible was shippped with an older
collection.
The group_vars dir is the standard destination for ansible to look for
variable-files. So I do not have to declare them in the main.yml
anymore. This change will make it easier for me to reason about upcoming
changes, like using a vault for sensitive information.
