[azure parallel] [doc build] Use docker image without Python

Author: lesteve

.circleci/config.yml

@@ -18,14 +18,12 @@ jobs:
 
   doc-min-dependencies:
     docker:
-      - image: cimg/python:3.9.18
+      - image: cimg/base:current-22.04
     environment:
       - MKL_NUM_THREADS: 2
       - OPENBLAS_NUM_THREADS: 2
       - CONDA_ENV_NAME: testenv
       - LOCK_FILE: build_tools/circle/doc_min_dependencies_linux-64_conda.lock
-      # Avoid using Python packages installed in the Docker image inside ~/.local/lib
-      - PYTHONNOUSERSITE: 1
       # Do not fail if the documentation build generates warnings with minimum
       # dependencies as long as we can avoid raising warnings with more recent
       # versions of the same dependencies.
@@ -58,14 +56,12 @@ jobs:
 
   doc:
     docker:
-      - image: cimg/python:3.9.18
+      - image: cimg/base:current-22.04
     environment:
       - MKL_NUM_THREADS: 2
       - OPENBLAS_NUM_THREADS: 2
       - CONDA_ENV_NAME: testenv
       - LOCK_FILE: build_tools/circle/doc_linux-64_conda.lock
-      # Avoid using Python packages installed in the Docker image inside ~/.local/lib
-      - PYTHONNOUSERSITE: 1
       # Make sure that we fail if the documentation build generates warnings with
       # recent versions of the dependencies.
       - SKLEARN_WARNINGS_AS_ERRORS: '1'
@@ -102,7 +98,7 @@ jobs:
 
   deploy:
     docker:
-      - image: cimg/python:3.9.18
+      - image: cimg/base:current-22.04
     steps:
       - checkout
       - run: ./build_tools/circle/checkout_merge_commit.sh