feat(ci): added yamllint

.gitlab/linting.yaml

@@ -1,10 +1,9 @@
 ---
 
 # linting
-linting:
+ansible-lint:
   stage: "linting"
-  image:
-    name: "docker.io/pipelinecomponents/ansible-lint:0.79.0"
+  image: "docker.io/pipelinecomponents/ansible-lint:0.79.0"
   rules:
 
     # run only on push to default branch
@@ -14,3 +13,18 @@ linting:
   # start linting
   script:
     - "ansible-lint -c .ansible-lint ."
+
+# yamllint
+yamllint:
+  stage: "linting"
+  image: "registry.gitlab.com/pipeline-components/yamllint:0.35.0"
+  rules:
+
+    # run only on push to default branch
+    - if: '$CI_PIPELINE_SOURCE == "push" && $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH'
+    - when: "never"
+
+  script:
+
+    # run yamllint
+    - "yamllint ."