ci: Install ansible so ansible-lint can resolve the modules

ansible-lint no longer depends on ansible[1][2] which causes it to fail
with: syntax-check: couldn't resolve module/action 'pacman', as the
modules is part of ansible and not ansible-base.

[1] https://bugs.archlinux.org/task/69920
[2] https://github.com/archlinux/svntogit-community/commit/a3ccb42b8dc104a4616a64fac4a1f6dd44ffedca

.gitlab-ci.yml

 image: "archlinux:latest"
 
 before_script:
-  - pacman -Syu --needed --noconfirm ansible-lint yamllint terraform
+  - pacman -Syu --needed --noconfirm ansible-lint ansible yamllint terraform
 
 ansible-lint:
   script: