Add gitlab ci and fix circle ci

Author: BoeingX

.circleci/config.yml

@@ -4,9 +4,6 @@ jobs:
   build:
     docker:
       - image: fpco/stack-build:lts-12.9
-    branches:
-      only:
-        - master
     steps:
       - checkout
 

.gitlab-ci.yml

@@ -0,0 +1,16 @@
+image: haskell:8.4.3
+cache:
+    key: ${CI_COMMIT_REF_SLUG}
+    paths:
+        - .stack-work/
+        - .stack-root/
+before_script:
+    - stack install --only-dependencies
+stages:
+    - test
+test:
+    stage: test
+    only:
+        - master
+    script:
+        - stack test