KASM-4579 use rolling images to build on scheduled builds and respect the private flag

ci-scripts/build.sh

@@ -5,6 +5,16 @@ NAME=$(echo $1| awk -F'|' '{print $1}')
 BASE=$(echo $1| awk -F'|' '{print $2}')
 DOCKERFILE=$(echo $1| awk -F'|' '{print $3}')
 
+# Determine if we are using private images
+if [ ${USE_PRIVATE_IMAGES} -eq 1 ]; then
+  BASE=${BASE}-private
+fi
+
+# Determine if this is a rolling build
+if [ "${CI_PIPELINE_SOURCE}" == "schedule" ]; then
+  BASE_TAG=${BASE_TAG}-rolling
+fi
+
 ## Build/Push image to cache endpoint by pipeline ID ##
 docker build \
   -t ${ORG_NAME}/image-cache-private:$(arch)-${NAME}-${SANITIZED_BRANCH}-${CI_PIPELINE_ID} \