ci: aggressive caching for front related jobs

Part-of: <https://dev.funkwhale.audio/funkwhale/funkwhale/-/merge_requests/2286>

.gitlab-ci.yml

@@ -20,6 +20,16 @@ variables:
     GIT_DEPTH: "5"
     FF_DISABLE_UMASK_FOR_DOCKER_EXECUTOR: "true"
 
+.shared_caches:
+  # Cache for front related jobs
+  front_cache: &front_cache
+    - key: front-yarn
+      paths: [$YARN_CACHE_FOLDER]
+    - key:
+        prefix: front-node_modules
+        files: [front/yarn.lock]
+      paths: [front/node_modules]
+
 default:
   tags:
     - docker
@@ -60,8 +70,7 @@ review_front:
   environment:
     name: review/front/$CI_COMMIT_REF_NAME
     url: http://$CI_PROJECT_NAMESPACE.pages.funkwhale.audio/-/$CI_PROJECT_NAME/-/jobs/$CI_JOB_ID/artifacts/front-review/index.html
-  cache:
-    paths: [$YARN_CACHE_FOLDER]
+  cache: *front_cache
   before_script:
     - mkdir front-review
     - cd front
@@ -163,8 +172,7 @@ lint_front:
     - changes: [front/**/*]
 
   image: $CI_REGISTRY/funkwhale/ci/node-python:18
-  cache:
-    paths: [$YARN_CACHE_FOLDER]
+  cache: *front_cache
   before_script:
     - cd front
     - yarn install --frozen-lockfile
@@ -227,8 +235,7 @@ test_front:
     - changes: [front/**/*]
 
   image: $CI_REGISTRY/funkwhale/ci/node-python:18
-  cache:
-    paths: [$YARN_CACHE_FOLDER]
+  cache: *front_cache
   before_script:
     - cd front
     - yarn install --frozen-lockfile
@@ -307,8 +314,7 @@ build_front:
   image: $CI_REGISTRY/funkwhale/ci/node-python:18
   variables:
     <<: *keep_git_files_permissions
-  cache:
-    paths: [$YARN_CACHE_FOLDER]
+  cache: *front_cache
   before_script:
     - cd front
     - yarn install --frozen-lockfile