ci check for ignored files

.woodpecker.yml

@@ -20,6 +20,13 @@ steps:
       - cargo run -- --print-config > config/defaults_current.toml
       - diff config/defaults.toml config/defaults_current.toml
 
+  ignored_files:
+    image: alpine:3
+    commands:
+      - apk add git
+      - IGNORED=$(git ls-files --cached -i --exclude-standard)
+      - if [[ "$IGNORED" ]]; then echo "Ignored files present:\n$IGNORED\n"; exit 1; fi
+
   check_diesel_schema:
     image: willsquire/diesel-cli
     environment: