uses argopkgs "continuous-integration" branch rolling reference.

.gitlab-ci.yml

@@ -4,6 +4,7 @@ stages:
 argotk.build:
   stage: build
   script:
-    - nix-build -I argopkgs=https://xgitlab.cels.anl.gov/argo/argopkgs/-/archive/master/argopkgs-master.tar.gz -A argotk
+    - nix-build -I argopkgs=https://xgitlab.cels.anl.gov/argo/argopkgs/-/archive/continuous-integration/argopkgs-continuous-integration.tar.gz -A argotk
+
   tags:
     - integration