Instead of building the docker files directly use the same docker.py
scripting as we do for building locally. This should help ensure we
use the exact same steps and allow us to cache properly when building
locally.

To get this working you have to have a fairly recent docker binary
otherwise you will see the error message:

 => ERROR importing cache manifest from registry.gitlab....

So far docker 19.03.12 works (from the docker apt repos) but 18.09.1,
build 4c52b90 which is packaged in Debian Buster fails.

Signed-off-by: Alex Bennée <alex.ben...@linaro.org>
---
 .gitlab-ci.d/containers.yml | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/.gitlab-ci.d/containers.yml b/.gitlab-ci.d/containers.yml
index f56aa44f711..e332af3cc46 100644
--- a/.gitlab-ci.d/containers.yml
+++ b/.gitlab-ci.d/containers.yml
@@ -8,14 +8,17 @@
   before_script:
     - export TAG="$CI_REGISTRY_IMAGE/qemu/$NAME:latest"
     - export COMMON_TAG="$CI_REGISTRY/qemu-project/qemu/$NAME:latest"
+    - apk add python3
     - docker info
     - docker login registry.gitlab.com -u "$CI_REGISTRY_USER" -p 
"$CI_REGISTRY_PASSWORD"
   script:
+    - echo "TAG:$TAG"
+    - echo "COMMON_TAG:$COMMON_TAG"
     - docker pull "$TAG" || docker pull "$COMMON_TAG" || true
-    - sed -i -e "s,FROM qemu/,FROM $CI_REGISTRY_IMAGE/qemu/," 
tests/docker/dockerfiles/$NAME.docker
-    - DOCKER_BUILDKIT=1 docker build --cache-from "$TAG" --cache-from 
"$COMMON_TAG" --tag "$TAG"
-                                     --build-arg BUILDKIT_INLINE_CACHE=1
-                                     -f 
"tests/docker/dockerfiles/$NAME.docker" tests/docker/dockerfiles
+    - ./tests/docker/docker.py --engine docker build
+          -t "qemu:$NAME" -f "tests/docker/dockerfiles/$NAME.docker"
+          -r $CI_REGISTRY_IMAGE
+    - docker tag "qemu:$NAME" "$TAG"
     - docker push "$TAG"
   after_script:
     - docker logout
-- 
2.20.1


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