[Buildroot] [PATCH] Add documentation about docker registry

[Thierry GUIBERT via buildroot <buildroot@buildroot.org>]

Signed-off-by: Thierry GUIBERT <thierry.guibert@croix-rouge.fr>
---
 docs/manual/adding-board-support.txt | 19 ++++++++++++++++---
 1 file changed, 16 insertions(+), 3 deletions(-)

diff --git a/docs/manual/adding-board-support.txt b/docs/manual/adding-board-support.txt
index cd90a5871f..f68e192468 100644
--- a/docs/manual/adding-board-support.txt
+++ b/docs/manual/adding-board-support.txt
@@ -48,9 +48,22 @@ and configurations in these directories, and reference them from the main
 Buildroot configuration. Refer to xref:customize[] for more details.
 
 Before submitting patches for new boards it is recommended to test it by
-building it using latest gitlab-CI docker container. To do this use
-utils/docker-run script and inside it issue these commands:
+building it using latest gitlab-CI docker container. 
+To do this use utils/docker-run script and inside it issue these commands:
 --------------------
- $ make +<boardname>_defconfig+
+ $ make <boardname>_defconfig
  $ make
 --------------------
+
+By defaut, buildroot developpers use our gitlab.com registry and it should
+be convenient for most usages. 
+If you still want to build your own docker images :
+--------------------
+ $ DOCKER_REGISTRY=registry.gitlab.com
+ $ IMAGE_NAME=buildroot.org/buildroot/base
+ $ IMAGE_TAG=YYYYMMDD.HHMM
+ $ docker build  --pull --no-cache \
+	-t ${DOCKER_REGISTRY}/${IMAGE_NAME}:${IMAGE_TAG} support/docker
+ $ docker push ${DOCKER_REGISTRY}/${IMAGE_NAME}:${IMAGE_TAG}
+--------------------
+
-- 
2.37.2

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