fix

.gitlab-ci.yml

@@ -7,7 +7,7 @@ generate pdf:
     entrypoint: [ "" ]
   stage: build
   script:
-    - pandoc --pdf-engine=lualatex --metadata-file=metadata.yml solutions/* -o solutions.pdf
+    - pandoc --pdf-engine=lualatex --metadata-file=metadata.yaml solutions/* -o solutions.pdf
   artifacts:
     paths:
       - solutions.pdf
\ No newline at end of file