CI caching

.gitlab-ci.yml

@@ -3,6 +3,15 @@ stages:
   - docs
   - deploy
 
+variables:
+  JULIA_DEPOT_PATH: "$CI_PROJECT_DIR/.julia"
+
+cache:
+  paths:
+    - $JULIA_DEPOT_PATH
+  key: "$CI_COMMIT_REF_SLUG"
+
+
 before_script:
   # workaround for https://github.com/JuliaDocs/Documenter.jl/issues/686
   - apt-get -qq update; apt-get -y install git