Merge branch 'prepare-gitlab-assets-compile' into 'master'

Move gitlab:assets-compile to prepare

See merge request gitlab-org/gitlab!22202

.gitlab/ci/frontend.gitlab-ci.yml

@@ -14,9 +14,7 @@
     - .assets-compile-cache
     - .only:changes-code-backstage-qa
   image: registry.gitlab.com/gitlab-org/gitlab-build-images:ruby-2.6.3-git-2.24-lfs-2.9-chrome-73.0-node-12.x-yarn-1.16-graphicsmagick-1.3.33-docker-19.03.1
-  stage: test
-  dependencies: ["setup-test-env"]
-  needs: ["setup-test-env"]
+  stage: prepare
   services:
     - docker:19.03.0-dind
   variables:

doc/development/pipelines.md

@@ -218,6 +218,8 @@ graph RL;
 
 subgraph "`prepare` stage"
     A
+    B
+    C
     F
     K
     J
@@ -225,8 +227,6 @@ subgraph "`prepare` stage"
     end
 
 subgraph "`test` stage"
-    B --> |needs| A;
-    C --> |needs| A;
     D --> |needs| A;
     H -.-> |needs and depends on| A;
     H -.-> |needs and depends on| K;