Try and be clever.

.drone.yml

@@ -6,7 +6,8 @@ steps:
   - name: test
     image: cisco-nso-base:5.3-jclarke
     commands:
-      - source /opt/ncs/current/ncsrc
+      - /run-nso.sh &
+      - . /opt/ncs/current/ncsrc
       - ncs_cli --help
       - apt-get update
       - echo "It worked"