- install pip packages from conda environment.

- explicit the corese-core-documentation environment.

.github/workflows/sphinx.yml

@@ -30,9 +30,8 @@ jobs:
     - name: Install dependencies
       run: |
         source /builds/miniconda3/etc/profile.d/conda.sh
+        conda env update -f conda-env/corese-core-documentation.yml
         conda activate corese-core-documentation
-        python -m pip install --upgrade pip
-        pip install -r docs/requirements.txt
 
     - name: Build Sphinx documentation with multiversion
       run: |

conda-env/corese-core-documentation.yaml

@@ -0,0 +1,19 @@
+name: corese-core-documentation
+channels:
+    - conda-forge
+dependencies:
+    - pip
+    - pip:
+          - sphinx>=7.1.2
+          - pydata_sphinx_theme>=0.14.4
+          - babel>=2.9
+          - packaging>=21.0
+          - docutils<0.21,>=0.18.1
+          - Jinja2>=3.0
+          - sphinx-design==0.5.0
+          - myst-parser==2.0.0
+          - sphinxcontrib-mermaid==0.9.2
+          - breathe==4.35.0
+          - exhale==0.3.7
+          - sphinx-copybutton>=0.5.0
+          - sphinx-multiversion>=0.2.4