Test Conda env is active in notebook container

Author: jakirkham

tests/container-canary/notebooks.yml

@@ -7,6 +7,14 @@ description: |
   are expected to have.
 documentation: https://github.com/rapidsai/docker
 checks:
+  - name: tst-conda-active
+    description: test the conda environment is active
+    probe:
+      exec:
+        command:
+          - /bin/bash
+          - -c
+          - '[ "${CONDA_EXE+x}" ];'
   - name: env-dask-cuda
     description: dask-labextension is configured to use dask-cuda by default via environment variables
     probe: