feat: Add dependency phase for easier caching

.gitlab-ci.yml

@@ -1,4 +1,5 @@
 stages:
+  - dependencies
   - test
   - deploy_tags
   - deploy
@@ -12,9 +13,37 @@ variables:
   DOCKER_HOST: tcp://docker:2376
   GIT_STRATEGY: fetch
 
+fetch_application_dependencies:
+  stage: dependencies
+  image: "elixir:1.10"
+  cache:
+    key:
+      files:
+        - mix.lock
+    paths:
+      - _build/
+      - deps/
+  script:
+    - mix deps.get
+
+fetch_asset_dependencies:
+  stage: dependencies
+  image: "node:15.0"
+  only:
+    - master
+  cache:
+    key:
+      files:
+        - apps/app/assets/package-lock.json
+    paths:
+      - apps/app/assets/node_modules/
+  script:
+    - cd apps/app/assets/ && npm install
+
 test:
   stage: test
-  needs: []
+  needs:
+    - fetch_application_dependencies
   image: "elixir:1.10"
   services:
   - name: postgres:12
@@ -29,26 +58,20 @@ test:
 
 build_image_for_commit:
   stage: test
-  needs: []
+  needs:
+    - fetch_asset_dependencies
+    - fetch_application_dependencies
   image: "docker:19.03.12"
   only:
     - master
   services:
     - name: docker:19.03.12-dind
-  cache:
-    key:
-      files:
-        - mix.lock
-        - apps/app/assets/package-lock.json
-    paths:
-      - _build/
-      - deps/
-      - apps/app/assets/node_modules/
   script:
     - docker login "https://${CI_REGISTRY}" -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD
     - docker pull $CI_REGISTRY_IMAGE:latest || true
     - docker build --cache-from $CI_REGISTRY_IMAGE:latest -t $CI_REGISTRY_IMAGE:$CI_COMMIT_SHA .
     - docker push $CI_REGISTRY_IMAGE:$CI_COMMIT_SHA
+    - docker cp $CI_REGISTRY_IMAGE:$CI_COMMIT_SHA:
 
 deploy_to_tags:
   stage: deploy_tags