Setup pipelines to not run in parallel to much

Use "interruptible" and "resource_group" to prevent too many expensive pipelines from stepping on each other. https://docs.gitlab.com/ee/ci/yaml/index.html#interruptible

.gitlab-ci.yml

@@ -317,7 +317,6 @@ jug_xl:singularity:nightly:
 ## trigger juggler rebuild on nightly schedule to ensure both images remain in sync
 juggler:master:
   stage: deploy
-  interruptible: true
   rules:
     - if: '$NIGHTLY != "0" && $CI_COMMIT_BRANCH == "master"'
       when: on_success