Use base environment for bdt to make it compatible with boa

bob/devtools/data/gitlab-ci/noarch.yaml

@@ -23,11 +23,11 @@ stages:
   before_script:
     - "[ -r ~/.condarc ] && rm -fv ~/.condarc"
     - curl --silent "${BOOTSTRAP}" --output "bootstrap.py"
-    - python3 bootstrap.py -vv channel bdt
+    - python3 bootstrap.py -vv channel base
     - source ${CONDA_ROOT}/etc/profile.d/conda.sh
     # for conda inspect during builds (on macos)
     - conda install -n base conda-build
-    - conda activate bdt
+    - conda activate base
     - bdt ci check -vv
   cache:
     paths: