test with mamba with shell init

.github/workflows/jobs.yml

@@ -41,6 +41,7 @@ jobs:
     - name: Set up Environment and Install Dependencies
       run: |
         conda activate test
+        mamba shell init --shell bash --root-prefix=~/.local/share/mamba
         mamba create -n pytest python=3.${{matrix.python-minor-version}} qgis=3.${{matrix.qgis-minor-version}} --yes
         mamba activate pytest
         mamba install --file requirements.txt --yes