fix(test-stage-template): run dockerd under docker-init

dockerd might fail from time to time which looks related to the
known issue docker-library/docker#318
and using docker-init is the workaround used by the community

Changelog: None
Ticket: QA-508
Signed-off-by: Alex Miliukov <oleksandr.miliukov@northern.tech>

gitlab-pipeline/stage/test.yml

@@ -201,7 +201,11 @@ test:backend-integration:azblob:enterprise:
     - apk --update add curl jq sysstat hdparm
 
     # Start dockerd in the background
-    - /usr/local/bin/dockerd &
+    # The entrypoint script additionally uses docker-init as workarround of known
+    # containerd issue - https://github.com/docker-library/docker/issues/318
+    - export TINI_SUBREAPER=true
+    - /bin/sh -c "/usr/local/bin/dockerd-entrypoint.sh &"
+
     # Wait for dockerd to start
     - |-
       MAX_WAIT=30