Update python in testing and reinstate mamba

.github/workflows/conda.yml

@@ -9,22 +9,25 @@ jobs:
       max-parallel: 5
 
     steps:
-    - uses: actions/checkout@v2
-    - name: Set up Python 3.8
-      uses: actions/setup-python@v2
+    - uses: actions/checkout@v3
+    - name: Set up Python 3.10
+      uses: actions/setup-python@v3
       with:
-        python-version: 3.8
+        python-version: 3.10
     - name: Add conda to system path
       run: |
         # $CONDA is an environment variable pointing to the root of the miniconda directory
         echo $CONDA/bin >> $GITHUB_PATH
+    - name: Install mamba
+      run: |
+        conda install -y -c conda-forge mamba
     - name: Create generic environment
       run: |
-        conda env create -f environment.yml
+        mamba env create -f environment.yml
     - name: Create R environment
       run: |
-        conda env create -f assets/r-environment.yml
+        mamba env create -f assets/r-environment.yml
     - name: Create conda environment
       run: |
-        conda remove -y -n nf-LO --all
-        conda env create -f assets/environment.yml
+        mamba remove -y -n nf-LO --all
+        mamba env create -f assets/environment.yml