CI: Replace mix test and mix coveralls with just mix coveralls

`mix coveralls` runs the tests by itself, exits with failure if one of them
fails and accepts the same args, so there is no reason to run two of
them at the same time.

diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 53f05ae9223bdb1e298cf54bbc932c6fbea491d5..939175218c277f3b2b694c6d2b7ca08d9094e15a 100644 (file)
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -52,8 +52,7 @@ unit-testing:
     - mix deps.get
     - mix ecto.create
     - mix ecto.migrate
-    - mix test --trace --preload-modules
-    - mix coveralls
+    - mix coveralls --trace --preload-modules
 
 unit-testing-rum:
   stage: test