try explicitly activating the env

ci/arcgis/Dockerfile

@@ -4,3 +4,17 @@ RUN mamba install --yes 'jupyter-server-proxy' && \
     mamba clean --all -f -y && \
     fix-permissions "${CONDA_DIR}" && \
     fix-permissions "/home/${NB_USER}"
+
+# Note: uncommenting this section makes "${env_name}" default both for Jupyter Notebook and Terminals
+# More information here: https://github.com/jupyter/docker-stacks/pull/2047
+ARG env_name=base
+USER root
+RUN \
+  # This changes a startup hook, which will activate the custom environment for the process
+  echo conda activate "${env_name}" >> /usr/local/bin/before-notebook.d/10activate-conda-env.sh && \
+  # This makes the custom environment default in Jupyter Terminals for all users which might be created later
+  echo conda activate "${env_name}" >> /etc/skel/.bashrc && \
+  # This makes the custom environment default in Jupyter Terminals for already existing NB_USER
+  echo conda activate "${env_name}" >> "/home/${NB_USER}/.bashrc"
+
+USER ${NB_UID}