Merge branch 'improve-ee-compat-check' into 'master'

Developer can just download the patch from the `ee_compat_check` job's artifact

See merge request !12967

lib/gitlab/ee_compat_check.rb

@@ -237,6 +237,10 @@ module Gitlab
       branch_name.parameterize << '.patch'
     end
 
+    def patch_url
+      "https://gitlab.com/gitlab-org/gitlab-ce/-/jobs/#{ENV['CI_JOB_ID']}/artifacts/raw/ee_compat_check/patches/#{ce_patch_name}"
+    end
+
     def step(desc, cmd = nil)
       puts "\n=> #{desc}\n"
 
@@ -303,14 +307,11 @@ module Gitlab
 
         2. Apply your branch's patch to EE
 
-          # In the CE repo
-          $ git fetch origin master
-          $ git diff --binary origin/master...HEAD -- > #{ce_branch}.patch
-
           # In the EE repo
           $ git fetch origin master
           $ git checkout -b #{ee_branch_prefix} origin/master
-          $ git apply --3way path/to/#{ce_branch}.patch
+          $ wget #{patch_url}
+          $ git apply --3way #{ce_patch_name}
 
           At this point you might have conflicts such as:
 
@@ -324,7 +325,7 @@ module Gitlab
           If the patch couldn't be applied cleanly, use the following command:
 
           # In the EE repo
-          $ git apply --reject path/to/#{ce_branch}.patch
+          $ git apply --reject #{ce_patch_name}
 
           This option makes git apply the parts of the patch that are applicable,
           and leave the rejected hunks in corresponding `.rej` files.