cache fix

src/build.sh

@@ -25,9 +25,8 @@ image_tagged="$CI_APPLICATION_REPOSITORY:$CI_APPLICATION_TAG"
 image_latest="$CI_APPLICATION_REPOSITORY:latest"
 
 # pull images for cache - this is required, otherwise --cache-from will not work
-docker image pull "$image_previous" || \
-  docker image pull "$image_latest" || \
-  true
+docker pull $(grep -ioP '(?<=^from)\s+\S+' Dockerfile)
+docker pull ${image_latest}
 
 docker build \
   --build-arg BUILDPACK_URL="$BUILDPACK_URL" \