ci(lint): fix when_path

.woodpecker/lint.yml

@@ -1,3 +1,8 @@
+variables:
+  - &when_path
+    - ".woodpecker/lint.yml"
+    - "**/*.lua"
+
 pipeline:
   lint:
     image: ghcr.io/lunarmodules/luacheck:v0.26.1
@@ -6,8 +11,7 @@ pipeline:
       - apk add just
       - just check-lua
     when:
-      path:
-        include: [".woodpecker/lint.yml", "*.lua"]
+      path: *when_path
 
   style:
     image: alpine:edge # Stylua is only available on edge repository for now
@@ -16,5 +20,4 @@ pipeline:
       - apk add just stylua
       - just check-format
     when:
-      path:
-        include: [".woodpecker/lint.yml", "*.lua"]
+      path: *when_path