Add woodpecker pipeline for yamllint

.woodpecker/.yamllint.yaml

@@ -0,0 +1,6 @@
+---
+steps:
+  - name: linting
+    image: cytopia/yamllint:latest
+    commands:
+      - yamllint -f colored -s .

.yamllint

@@ -0,0 +1,10 @@
+---
+yaml-files:
+  - '*.yaml'
+  - '*.yml'
+  - '.yamllint'
+
+extends: default
+
+rules:
+  line-length: disable