Pre stage pipeline fix (#564)

Fixes the occasional problem where the find command ends up deleting the whole parent directory, and cause the pipeline to immediately fail. Adding the mindepth flag prevents that from happening.

Author: ryandanehy

.gitlab-ci.yml

@@ -199,7 +199,7 @@ pnnl_cleanup:
   - |
     set -xv
     export WORKDIR="$HOME/gitlab/"
-    find $WORKDIR -type d -mmin +360 -prune -print -exec rm -rf {} \; || true
+    find $WORKDIR -type d -mindepth 1 -mmin +360 -prune -print -exec rm -rf {} \; || true
     ls -hal $WORKDIR
   <<: *pnnl_tags_definition
   rules: