Merge branch '54065-bump-minimum-node-version-to-8' into 'master'

Bump minimal node version from 6 to 8.10.0

Closes #54065

See merge request gitlab-org/gitlab-ce!24305

.gitlab-ci.yml

@@ -804,10 +804,6 @@ qa:selectors:
     - yarn run webpack-prod
   <<: *except-docs
 
-qa-frontend-node:6:
-  <<: *qa-frontend-node
-  image: node:6-alpine
-
 qa-frontend-node:8:
   <<: *qa-frontend-node
   image: node:8-alpine

doc/development/fe_guide/index.md

@@ -21,8 +21,8 @@ We also use [Axios][axios] to handle all of our network requests.
 We also utilize [webpack][webpack] to handle the bundling, minification, and
 compression of our assets.
 
-Working with our frontend assets requires Node (v6.0 or greater) and Yarn
-(v1.2 or greater).  You can find information on how to install these on our
+Working with our frontend assets requires Node (v8.10.0 or greater) and Yarn
+(v1.10.0 or greater). You can find information on how to install these on our
 [installation guide][install].
 
 ### Browser Support

package.json

@@ -163,6 +163,7 @@
     "yarn-deduplicate": "^1.0.5"
   },
   "engines": {
+    "node": ">=8.10.0",
     "yarn": "^1.10.0"
   }
 }