Use personal access token for API calls

ci/registry_cleanup.sh

@@ -16,6 +16,7 @@ set -ex
 for image_dir in $IMAGES_TO_BUILD; do
     image_name=$(basename $image_dir)
     docker_reg_id=$(registry_id "$image_name")
-    curl -XDELETE -H "PRIVATE-TOKEN: ${CI_JOB_TOKEN}" -d 'name_regex=dev_.*' -d "keep_n=5" "${PROJ_URL}/registry/repositories/${docker_reg_id}/tags"
+    # use Personal Access Token created by David Hoese and stored in CI environment variables
+    curl -XDELETE -H "PRIVATE-TOKEN: ${API_TOKEN}" -d 'name_regex=dev_.*' -d "keep_n=5" "${PROJ_URL}/registry/repositories/${docker_reg_id}/tags"
 done