.gitlab-ci.yml

@@ -5,4 +5,5 @@ before_script:
 test:
   image: debian:stable
   script:
-    - jekyll build --verbose --trace
+    - make
+    - make lint

Makefile

+OLD_LAYOUTS = $(notdir $(basename $(wildcard _layouts/*.html)))
+
+all:
+	jekyll build --verbose --trace
+
+clean:
+	rm -rf _site
+
+lint:
+	for X in $(OLD_LAYOUTS); do \
+		grep -rl "layout: $$X" . | while read Y; do \
+			echo "W: $$Y is using legacy layout '$$X'"; \
+		done \
+	done