ci: fix MIX_ENV in compilation step + uncomment dialyzer job

.gitlab-ci.yml

@@ -73,22 +73,19 @@ credo:
     paths:
       - "credo.log"
 
-## this should be uncommented when
-## https://gitlab.com/gitlab-org/gitlab-runner/-/issues/27172
-## is fixed
-# dialyzer:
-#   stage: dialyzer
-#   needs:
-#     - prepare_test
-#   script:
-#     - mix dialyzer
-#   cache: 
-#     <<: *global_cache
-#     policy: pull-push
-#     paths:
-#       - _build
-#       - deps
-#       - priv/plts
+dialyzer:
+  stage: dialyzer
+  needs:
+    - prepare_test
+  script:
+    - mix dialyzer
+  cache: 
+    <<: *global_cache
+    policy: pull-push
+    paths:
+      - _build
+      - deps
+      - priv/plts
 
 
 # Doc generation
@@ -98,7 +95,7 @@ prepare_dev:
   only:
     - master
   variables:
-    MIX_ENV: test
+    MIX_ENV: dev
   script:
     - mix deps.get
     - mix compile