ci(lint): fix `when` closes

.woodpecker/lint.yml

@@ -1,3 +1,8 @@
+variables: &when
+  when:
+    path:
+      include: [".woodpecker/lint.yml", "*.lua"]
+
 pipeline:
   lint:
     image: ghcr.io/lunarmodules/luacheck:v0.26.1
@@ -5,14 +10,11 @@ pipeline:
     commands:
       - apk add just
       - just check-lua
+    when: *when
   style:
     image: alpine:edge # Stylua is only available on edge repository for now
     group: lint
     commands:
       - apk add just stylua
       - just check-format
-
-when:
-  branch: master
-  path:
-    include: [ '.woodpecker/lint.yml', '*.lua' ]
+    when: *when