Updating .gitignore with new repos

Adding the following to .gitignore for new repos
added to the manifest
- docs
- test
- zuul-jobs

Depends-On: https://review.opendev.org/681508
Change-Id: If1a1dedac5a750d5cbbae25f7c0ea90645b36edc
Signed-off-by: Don Penney <don.penney@windriver.com>

stx/.gitignore

@@ -13,6 +13,7 @@ installer-prebuilt
 /config-files
 /containers
 /distcloud-client
+/docs
 /downloads
 /fault
 /git
@@ -27,6 +28,8 @@ installer-prebuilt
 /openstack-armada-app
 /platform-armada-app
 /stx-puppet
+/test
 /update
 /upstream
 /utilities
+/zuul-jobs