ci-dockerfiles-sanity-check: export DOCKER_SUFFIX="-check"

The idea is that docker image building scripts will use $DOCKER_SUFFIX to
name images, to prevent name clashing between sanity-check images and
actual production images.

Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>
Change-Id: I99c11ea49c4a1671af5dcf9b01ddef04caf72ae0
diff --git a/ci-dockerfiles-sanity-check.yaml b/ci-dockerfiles-sanity-check.yaml
index b29ec14..0e745a3 100644
--- a/ci-dockerfiles-sanity-check.yaml
+++ b/ci-dockerfiles-sanity-check.yaml
@@ -63,6 +63,8 @@
         - build-name-setter:
             name: 'version.txt'
             file: true
+        - shell: |
+            export DOCKER_SUFFIX="-check"
         - shell:
             !include-raw: ci-dockerfiles-deployment/builders.sh
         - shell: