Try prepre-conda block

.github/workflows/coding-style.yml

@@ -12,6 +12,10 @@ on:
 permissions:
   contents: read
 
+.prepare-conda: &prepare-conda
+  - source $CONDA/etc/profile.d/conda.sh
+  - conda activate
+
 jobs:
   Flake8:
     runs-on: ubuntu-latest
@@ -50,15 +54,13 @@ jobs:
         python-version: ${{ matrix.python-version }}
     - name: Install dependencies
       run: |
-        source $CONDA/etc/profile.d/conda.sh
-        conda activate
+        *prepare-conda
         conda install -y -c conda-forge mayavi traits traitsui pyface pyfmi h5py mpi4py pytest-cov psutil pytables pyyaml matplotlib mamba pandas openpyxl jupyter jupyter-book flake8 pylint
         #python -m pip install --upgrade pip
         #pip install pylint
         # Install the package itself to make sure that all imports work.
         pip install .
     - name: Analysing the code with pylint
       run: |
-        source $CONDA/etc/profile.d/conda.sh
-        conda activate
+        *prepare-conda
         pylint $(git ls-files '*.py') --fail-under=7.0