Point to new context

Author: Diego Ardila

.circleci/config.yml

@@ -48,11 +48,9 @@ jobs:
       - store_artifacts:
           path: test_results      
       - slack/notify:
-          channel: nucleus-builders
           event: pass
           template: basic_fail_1
       - slack/notify:
-          channel: nucleus-builders
           event: fail
           template: basic_fail_1
 
@@ -107,11 +105,11 @@ workflows:
                 - master
     jobs:
       - build_test:
-          context: slack-secrets
+          context: Nucleus
   build_test_publish:
     jobs:
       - build_test:
-          context: slack-secrets
+          context: Nucleus
           filters:
             tags:
               only: /^v\d+\.\d+\.\d+$/ # Runs only for tags with the format [v1.2.3]