Tentative workaround to yaml upgrade failure

Dockerfile

@@ -43,6 +43,10 @@ RUN conda install mamba -c conda-forge
 COPY environment.yml .
 RUN mamba env update -n base -f environment.yml && rm environment.yml
 
+# Workaround: pip installed nbgrader-dev requires pyyaml 5.4
+# but pip refuses by default to upgrade conda's pyyaml 5.3
+RUN sudo -H pip3 install --ignore-installed PyYAML
+
 # The repo for the course "Introduction à la science des données"
 # is outdated and clashes with other courses (nbgrader configuration).
 # Disabled

environment.yml

@@ -46,9 +46,6 @@ dependencies:
 # in the course "Traitement de données hydrologiques" of M2 HSS
 - r-factominer
 
-# Attempt to avoid it being installed by pip in later environments
-- pyyaml
-
 - pip:
     # For Erwan Pannier <erwan.pannier@centralesupelec.fr>
     # A fast line-by-line code for high-resolution infrared molecular spectra