test/doc changes on 90 (#1292)

* Use match job in docs-preview build (#1289)

* Make preview build steps dependant on match job output

* Use match job in docs-preview build

* remove unused env

* Temporarily mark docs-builder's current branch to 9.0 (#1290)

* Test: 9.0 doc changes

Author: Mpdreamz

docs/testing/archive.md

@@ -5,4 +5,6 @@ description: Browse the archive for legacy Elastic products and documentation. A
 
 # Archive
 
-This is a test modification on 9.0 branch
+This is a test modification on 9.0 branch
+
+These are other modifications

src/tooling/docs-assembler/assembler.yml

@@ -102,4 +102,6 @@ references:
   search-ui:
   integration-docs:
   docs-builder:
+    current: 9.0
+    next: main
     skip: true