conda install R on test workflow

Author: mathurinm

.github/workflows/main.yml

@@ -16,14 +16,15 @@ jobs:
     - name: Set up Python 3.8
       uses: actions/setup-python@v3
       with:
-        python-version: 3.8
+        python-version: 3.10
     - name: Install package and testing tools
       run: |
         python -m pip install --upgrade pip
         pip install .
         pip install .[test]
     - name: Install other dependencies
       run: |
+        conda install r
         pip install celer
         pip install statsmodels cvxopt
         pip install git+https://github.com/jolars/pyslope.git