[gitlab-ci] Force install of conda-build on base environment to handle conda...

[gitlab-ci] Force install of conda-build on base environment to handle conda inspect requirmenets in macos builds [ci skip]

bob/devtools/data/gitlab-ci/single-package.yaml

@@ -26,6 +26,8 @@ stages:
     - curl --silent "${BOOTSTRAP}" --output "bootstrap.py"
     - python3 bootstrap.py -vv channel bdt
     - source ${CONDA_ROOT}/etc/profile.d/conda.sh
+    # for conda inspect during builds (on macos)
+    - conda install -n base conda-build
     - conda activate bdt
     - bdt ci check -vv
   cache: