gitlab pipeline: more reasonable artefact

.gitlab-ci.yml

-image: haskell
+image: haskell:8.10.7
 
 stages:
   - build
@@ -7,6 +7,9 @@ build-job:
   stage: build
   script:
     - stack build --install-ghc
+    - mkdir dist
+    - cp .stack-work/install/x86_64-linux-tinfo6/*/*/bin/walint dist
+    - cp config.json dist
   artifacts:
     paths:
-      - .stack-work/install/x86_64-linux-tinfo6/*/*/bin/walint
+      - dist