update of docker build prep

.gitlab-ci.yml

@@ -18,6 +18,18 @@ variables:
 stages:
   - build
   - release
+
+clonedss:
+  stage: prepare
+  script:
+    - echo "Clone..."
+     - git clone https://github.com/esig/dss-demonstrations.git ${DSS_WORKDIR}
+  artifacts:
+    paths:
+      - ${DSS_WORKDIR}
+    expire_in: 1 hour 
+
+
 docker-build:
   extends: .buildkit
   stage: build
@@ -28,8 +40,9 @@ docker-build:
     CI_REGISTRY_PASSWORD: ${HARBOR_PASSWORD}
     CI_REGISTRY_IMAGE: ${HARBOR_HOST}/${HARBOR_PROJECT}/${CI_PROJECT_NAME}
     BUILD_ARG: $[[ inputs.docker_args ]]
-  script:
-    - git clone https://github.com/esig/dss-demonstrations.git ${DSS_WORKDIR}
+  dependencies:
+    - clonedss
+