feat: introduce GitLab login variable

Signed-off-by: Matej Focko <mfocko@redhat.com>

inventory/global.yml

@@ -1,6 +1,7 @@
 ---
 all:
   vars:
+    gitlab_login: "mfocko"
     target_user: "mfocko"
     fullname: "Matej Focko"
     git_email: "me@mfocko.xyz"

roles/user/ssh/tasks/main.yml

@@ -8,7 +8,7 @@
 
 - name: Install ‹.ssh/authorized_keys›
   ansible.builtin.get_url:
-    url: https://gitlab.com/mfocko.keys
+    url: https://gitlab.com/{{ gitlab_login }}.keys
     dest: ~/.ssh/authorized_keys
     mode: 0600
   tags: ssh/authorized-keys