Try with a new container.

.gitlab-ci.yml

@@ -1,14 +1,12 @@
-image: fpco/stack-build:lts-10.8
+image: quay.io/dbalan/hakyll:master
 
 cache:
   paths:
-    - /root/.stack/programs/
     - _cache/
     - .stack-work/
 
 test:
   script:
-    - stack setup
     - stack build
     - stack exec site build
 
@@ -27,7 +25,6 @@ deploy:
     - mkdir -p ~/.ssh
     - echo -e "Host *\n\tStrictHostKeyChecking no\n\n" > ~/.ssh/config
 
-    - stack setup
   script:
     - stack build
     - stack exec site build