Merge branch 'master' into 'master'

add gitlab-ci.yml

See merge request archlinux/infrastructure!7

.gitlab-ci.yml

+image: "archlinux:latest"
+
+before_script:
+  - pacman -Syu --needed --noconfirm ansible-lint
+
+ansible-lint:
+  script:
+    # fix weird ansible bug
+    - chmod o-w .
+    - ansible-lint