Fix and improve caching in GitLab CI

.gitlab-ci.yml

@@ -13,19 +13,20 @@ stages:
       - public
     expire_in: 1d
 
-.cache_latest: &cache_latest
+.caching: &caching
   cache:
-    key: latest
-    paths:
-      - vendor/bundle
-      - assets/img/jumbotrons
-
-.cache_production: &cache_production
-  cache:
-    key: production
-    paths:
-      - vendor/bundle
-      - assets/img/jumbotrons
+    - key:
+        files:
+          - Gemfile.lock
+        prefix: "$CI_JOB_IMAGE"
+      paths:
+        - vendor/bundle
+    - key: jumbotron-cache
+      paths:
+        - assets/img/jumbotrons/desktop
+        - assets/img/jumbotrons/display_2k
+        - assets/img/jumbotrons/phone
+        - assets/img/jumbotrons/tablet
 
 .common_production: &production_before_script
   before_script:
@@ -36,7 +37,7 @@ stages:
     - gem install bundler --no-document
     - bundle config set without 'test'
     - bundle install --jobs $(nproc)
-  <<: *cache_production
+  <<: *caching
 
 .common_latest: &latest_before_script
   before_script:
@@ -48,7 +49,7 @@ stages:
     - bundle config set without 'test'
     - bundle install --jobs $(nproc) --without test "${FLAGS[@]}"
     - bundle update --jobs $(nproc) "${FLAGS[@]}"
-  <<: *cache_latest
+  <<: *caching
 
 .common_variables: &common_variables
   GIT_SUBMODULE_STRATEGY: recursive
@@ -109,7 +110,7 @@ stages:
         --assume-extension public/"
     # Use yaml-lint tool to check yaml files.
     - "bundle exec yaml-lint _data/ _config.yml"
-  <<: *cache_production
+  <<: *caching
   # https://docs.gitlab.com/ce/ci/yaml/#interruptible
   interruptible: true