Several defects accumulated in this task file and are fixed together, because they overlap in the same code paths.
The debug task was dead code. Its `msg` lacked the Jinja delimiters and would have printed the literal string
`_unix_users_btrfs_device.stdout`, and it was gated on `_unix_users_debug`, a variable that is neither defined in
defaults nor documented anywhere. It is removed instead of repaired, since the failure path already reports the device.
The four `ansible.builtin.user` tasks differed only in whether `uid` and `groups` were passed. They are collapsed into a
single task using `default(omit)`, which removes the risk that a fix lands in one of the four copies only. This also
fixes `comment`, which dereferenced `unix_user.value.name` unconditionally and aborted for every user that did not set
the undocumented and supposedly optional key.
Two conditions compared a length against zero with `>=`, which is true for any list. As a result an empty `ssh.config`
still produced a config file, and the removal counterpart never triggered. The create and remove pair for `.ssh/config`
now mirrors the one already used for `authorized_keys`.
The private key source was resolved through `{{ playbook_dir }}`, while the authorized key lookup in the template uses
the regular relative search path. Both now use the same mechanism, which is a superset of the previous location, so
existing playbook layouts keep working, and the role becomes testable from a molecule scenario.
BREAKING CHANGE:
The `.ssh` directory is only created when a user actually declares an `ssh` key, and an empty `ssh.config` list now
removes the client config instead of writing an empty one. Users who relied on the role to pre create an empty `~/.ssh`
have to declare `ssh: {}` explicitly.
Co-authored-by: Copilot <copilot@github.com>